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Exhibit 99.4

Supplementary Information of

GILDAN ACTIVEWEAR INC.

Three years ended October 2, 2011

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| | KPMG LLP                      | Telephone (514) 840-2100
| | ----------------------------- | ------------------------
| | Chartered Accountants         | Fax (514) 840-2187      
| | 600 de Maisonneuve Blvd. West | Internet www.kpmg.ca    
| | Suite 1500                    |                         
| | Montréal Québec H3A 0A3       |                         

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM ON
RECONCILIATION TO UNITED STATES GAAP

To the Board of Directors of Gildan Activewear Inc.

On November 30, 2011, we reported on the consolidated balance
sheets of Gildan Activewear Inc. (the "Company") as at October 2, 2011 and
October 3, 2010 and the consolidated statements of earnings and comprehensive
income, shareholders equity and cash flows for the years ended October 2, 2011,
October 3, 2010 and October 4, 2009, which are included in the annual report on
Form 40-F. Our audits were for the purpose of forming an opinion on the basic
consolidated financial statements taken as a whole. The supplementary
information included in the related supplementary schedule entitled
"Reconciliation to United States GAAP" included in the Form 40-F is presented
for purposes of additional analysis and requirements under securities
legislation. Such supplementary information has been subject to the audit
procedures applied in the audits of the basic consolidated financial statements
and, in our opinion, is fairly stated in all material respects in relation to
the basic consolidated financial statement taken as a whole.



Chartered Accountants

Montréal, Canada November 30, 2011



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|GILDAN ACTIVEWEAR INC.                                                                   
|-----------------------------------------------------------------------------------------
|Reconciliation to United States GAAP                                                     
|                                                                                         
|Years ended October 2, 2011, October 3, 2010 and October 4,
      2009                   
|(Tabular amounts
      in thousands or thousands of US dollars, except per share amounts)

The consolidated financial statements of the Company are
expressed in U.S. dollars and are prepared in accordance with Canadian generally
accepted accounting principles ("GAAP"), which conform, in all material
respects, with accounting principles generally accepted in the United States
(United States GAAP), except as described below:

|(a) | Consolidated statements of earnings and comprehensive
      income:
|--- | -------------------------------------------------------------------

| |                                                              |   | 2011    |   |   | 2010    |   |   | 2009   | 
| | ------------------------------------------------------------ | - | ------- | - | - | ------- | - | - | ------ | 
| |                                                              |   |         |   |   |         |   |   |        | 
| | Net earnings as per Canadian
      GAAP                      | $ | 239,904 |   | $ | 198,245 |   | $ | 95,329 | 
| |                                                              |   |         |   |   |         |   |   |        | 
| | Adjustments:                                                 |   |         |   |   |         |   |   |        | 
| | Transaction costs (i)                                        |   | (7,271  | ) |   | (600    | ) |   | -      | 
| | Non-controlling interest in consolidated joint venture (ii)  |   | 504     |   |   | 3,786   |   |   | 110    | 
| | Remeasurement of
      contingent consideration (i)          |   | 1,460   |   |   | -       |   |   | -      | 
| | Lease
      termination costs (i)                            |   | (395    | ) |   | -       |   |   | -      | 
| | Net pension expense (i)                                      |   | (3,506  | ) |   | -       |   |   | -      | 
| | Tax effect of above adjustments                              |   | 2,584   |   |   | -       |   |   | -      | 
| | Net
      earnings as per United States GAAP                 | $ | 233,280 |   | $ | 201,431 |   | $ | 95,439 | 
| |                                                              |   |         |   |   |         |   |   |        | 
| | Net earnings attributable to:                                |   |         |   |   |         |   |   |        | 
| | Shareholders of Gildan
      Activewear Inc.                 | $ | 232,776 |   | $ | 197,645 |   | $ | 95,329 | 
| | Non-controlling interest in consolidated joint venture       | $ | 504     |   | $ | 3,786   |   | $ | 110    | 
| |                                                              |   |         |   |   |         |   |   |        | 
| |                                                              |   |         |   |   |         |   |   |        | 
| |                                                              |   | 2011    |   |   | 2010    |   |   | 2009   | 
| |                                                              |   |         |   |   |         |   |   |        | 
| | Net earnings as per United
      States GAAP                 | $ | 233,280 |   | $ | 201,431 |   | $ | 95,439 | 
| | Other comprehensive loss, net of related income taxes        |   | (1,276  | ) |   | (1,710  | ) |   | -      | 
| | Comprehensive income as per United States GAAP               | $ | 232,004 |   | $ | 199,721 |   | $ | 95,439 | 
| |                                                              |   |         |   |   |         |   |   |        | 
| | Comprehensive income
      attributable to:                  |   |         |   |   |         |   |   |        | 
| | Shareholders of Gildan Activewear Inc.                       | $ | 231,500 |   | $ | 195,935 |   | $ | 95,329 | 
| | Non-controlling interest in consolidated joint
      venture | $ | 504     |   | $ | 3,786   |   | $ | 110    | 

P.1

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|GILDAN ACTIVEWEAR INC.                                                                   
|-----------------------------------------------------------------------------------------
|Reconciliation to United States GAAP                                                     
|                                                                                         
|Years ended October 2, 2011, October 3, 2010 and October 4,
      2009                   
|(Tabular amounts
      in thousands or thousands of US dollars, except per share amounts)

|(a) | Consolidated statements of earnings and comprehensive
      income (continued):
|--- | -------------------------------------------------------------------------------

| |                                                              |   | 2011    |  |   | 2010    |  |   | 2009    | 
| | ------------------------------------------------------------ | - | ------- |  | - | ------- |  | - | ------- | 
| |                                                              |   |         |  |   |         |  |   |         | 
| | Earnings per share
      attributable to the shareholders of |   |         |  |   |         |  |   |         | 
| | Gildan Activewear Inc. as per United
      States GAAP:      |   |         |  |   |         |  |   |         | 
| | Basic                                                        | $ | 1.92    |  | $ | 1.63    |  | $ | 0.79    | 
| | Diluted                                                      |   | 1.90    |  |   | 1.62    |  |   | 0.79    | 
| |                                                              |   |         |  |   |         |  |   |         | 
| | Weighted average number of common shares
      outstanding   |   |         |  |   |         |  |   |         | 
| | Basic                                                        |   | 121,526 |  |   | 121,159 |  |   | 120,811 | 
| | Diluted                                                      |   | 122,283 |  |   | 121,980 |  |   | 121,435 | 

|(b) | Consolidated statements of shareholders
      equity:
|--- | ------------------------------------------------------

A reconciliation of shareholders
equity under Canadian GAAP to United States GAAP is as follows:

| |                                                             |   | 2011      |   |   | 2010      |  
| | ----------------------------------------------------------- | - | --------- | - | - | --------- | -
| |                                                             |   |           |   |   |           |  
| | Shareholders' equity as per
      Canadian GAAP             | $ | 1,327,315 |   | $ | 1,114,429 |  
| |                                                             |   |           |   |   |           |  
| | Adjustments:                                                |   |           |   |   |           |  
| | Transaction costs (i)                                       |   | (7,871    | ) |   | (600      | )
| | Remeasurement of contingent consideration (i)               |   | 1,460     |   |   | -         |  
| | Lease termination costs
      (i)                           |   | (395      | ) |   | -         |  
| | Net
      pension expense (i)                               |   | (3,506    | ) |   | -         |  
| | Tax effect of above
      adjustments                       |   | 2,584     |   |   | -         |  
| | Non-controlling interest in consolidated joint venture (ii) |   | 11,562    |   |   | 11,058    |  
| | Pension liability adjustment, net of tax
      (iii)        |   | (2,310    | ) |   | -         |  
| | Shareholders' equity as per United States GAAP              | $ | 1,328,839 |   | $ | 1,124,887 |  

P.2

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|GILDAN ACTIVEWEAR INC.                                                                   
|-----------------------------------------------------------------------------------------
|Reconciliation to United States GAAP                                                     
|                                                                                         
|Years ended October 2, 2011, October 3, 2010 and October 4,
      2009                   
|(Tabular amounts
      in thousands or thousands of US dollars, except per share amounts)

|(c) | Consolidated statements of cash
  flows:
|--- | ----------------------------------------

| |                                                                                                       |   | 2011     |   |   | 2010     |   |   | 2009    |  
| | ----------------------------------------------------------------------------------------------------- | - | -------- | - | - | -------- | - | - | ------- | -
| |                                                                                                       |   |          |   |   |          |   |   |         |  
| | Cash flows from operating
      activities:                                                           |   |          |   |   |          |   |   |         |  
| | Net cash provided by operating activities as
      per Canadian GAAP                                  | $ | 181,550  |   | $ | 301,551  |   | $ | 169,179 |  
| |                                                                                                       |   |          |   |   |          |   |   |         |  
| | United States GAAP adjustments to:                                                                    |   |          |   |   |          |   |   |         |  
| | Net
      earnings                                                                                    |   | (6,624   | ) |   | 3,186    |   |   | 110     |  
| | Future income taxes                                                                                   |   | (2,584   | ) |   | -        |   |   | -       |  
| | Non-controlling interest in consolidated joint venture                                                |   | (504     | ) |   | (3,786   | ) |   | (110    | )
| | Accounts payable and
      accrued liabilities                                                        |   | 2,046    |   |   | -        |   |   | -       |  
| | Other                                                                                                 |   | 395      |   |   | -        |   |   | -       |  
| |                                                                                                       |   |          |   |   |          |   |   |         |  
| | Net cash provided by
      operating activities as per United States GAAP                             |   | 174,279  |   |   | 300,951  |   |   | 169,179 |  
| |                                                                                                       |   |          |   |   |          |   |   |         |  
| | Net cash provided by (used
      in) financing activities as per Canadian GAAP and United States GAAP |   | 172,832  |   |   | (1,359   | ) |   | (47,711 | )
| |                                                                                                       |   |          |   |   |          |   |   |         |  
| | Net cash used in investing
      activities as per Canadian GAAP                                      |   | (523,937 | ) |   | (141,246 | ) |   | (34,198 | )
| |                                                                                                       |   |          |   |   |          |   |   |         |  
| | United States GAAP
      adjustments to:                                                              |   |          |   |   |          |   |   |         |  
| | Business acquisitions                                                                                 |   | 7,271    |   |   | 600      |   |   | -       |  
| | Net cash used in investing
      activities as per United States GAAP                                 |   | (516,666 | ) |   | (140,646 | ) |   | (34,198 | )
| |                                                                                                       |   |          |   |   |          |   |   |         |  
| | Effect of exchange rate changes on cash and cash
      equivalents denominated in foreign currencies  |   | (85      | ) |   | (236     | ) |   | 105     |  
| | Net (decrease) increase in cash and cash
      equivalents during the year                            |   | (169,640 | ) |   | 158,710  |   |   | 87,375  |  
| | Cash and cash equivalents, beginning of year                                                          |   | 258,442  |   |   | 99,732   |   |   | 12,357  |  
| | Cash
      and cash equivalents, end of year                                                          | $ | 88,802   |   | $ | 258,442  |   | $ | 99,732  |  

P.3

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|GILDAN ACTIVEWEAR INC.                                                                   
|-----------------------------------------------------------------------------------------
|Reconciliation to United States GAAP                                                     
|                                                                                         
|Years ended October 2, 2011, October 3, 2010 and October 4,
      2009                   
|(Tabular amounts
      in thousands or thousands of US dollars, except per share amounts)

Notes to the United States GAAP adjustments:

|(i)   | Business combinations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|----- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|      | Effective October 5, 2009, the Company adopted the new
      accounting standard for business combinations in Accounting Standards
      Codification 805, Business Combinations (ASC 805).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|      | Acquisition related costs- Under ASC 805,
      restructuring charges (such as lease termination costs) and transaction
      costs directly related to the acquisition are expensed as incurred. Under
      Canadian GAAP, restructuring and other acquisition-related costs of a
      business combination are included in the cost of the purchase, subject to
      certain conditions. The adjustment for transaction costs of $7.3 million
      (2010 - $0.6 million) and lease termination costs of $0.4 million
      represents acquisition-related costs which were included in the cost of
      business combinations, for Canadian GAAP purposes, which occurred in
      fiscal 2011.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|      | Contingent consideration- Under ASC 805, the
      estimated fair value of contingent consideration is recognized at the
      acquisition date and a remeasurement adjustment to fair value is recorded
      at each reporting date with an offset to current period earnings. Under
      Canadian GAAP, contingent consideration is not recorded at the date of
      acquisition unless the outcome of the contingency can be determined beyond
      a reasonable doubt. The adjustment for the remeasurement of contingent
      consideration of $1.5 million represents the decrease in the fair value of
      the contingent consideration of $5.3 million recognized under U.S. GAAP at
      the date of acquisition, which was not recognized under Canadian GAAP for
      a business combination which occurred in fiscal 2011.                                                                                                                                                                                                                                                                                                                                                                                                                            
|      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|      | Accrued benefit liabilities Under ASC 805, the
      effects of any planned, but not executed, amendments, terminations, or
      curtailments to defined benefit pension plans and other postretirement
      plans acquired are excluded from the measurement of the funded status of
      those plans at the date of acquisition. Planned or anticipated amendments,
      terminations, or curtailments are not part of the liabilities assumed as
      of the acquisition date. Such actions are recognized in the post business
      combination financial statements as a charge or credit to earnings. Under
      Canadian GAAP, the accrued benefit asset or accrued benefit liability at
      the time of acquisition is measured based on the amount expected to be
      received or paid on settlement, when the plan is expected to be wound up.
      As a result of the difference in the initial measurement of the accrued
      pension benefit liability at the date of acquisition, as well as the
      subsequent impact on net earnings related to differences in the
      measurement of the accrued benefit liability as at October 2, 2011, an
      adjustment for a charge of $3.5 million was required under United States
      GAAP.
|      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|(ii)  | Non-controlling interest in consolidated joint
      venture                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|      | Effective October 5, 2009, the Company adopted the new
      accounting standard for consolidation in Accounting Standards Codification
      810, Consolidation (ASC 810). Under ASC 810, non-controlling interest is
      presented as a separate component of shareholders equity (as opposed to a
      separate caption between liabilities and equity). In addition, the portion
      of net earnings and comprehensive income attributable to the controlling
      and non-controlling interests must be presented separately in the
      statement of earnings and comprehensive income. This adjustment reflects
      the presentation of non- controlling interests as required under United
      States GAAP.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|(iii) | Defined Benefit Pension Plans                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|      | Under U.S. GAAP, Accounting Standards Codification 715,
      Compensation  Retirement Benefits (ASC 715), the Company is required to
      recognize the funded status of defined benefit pension plans on the
      balance sheet. The accumulated benefit obligation for the defined benefit
      pension plan acquired through a business combination which occurred in
      fiscal 2011 exceeds the fair value of plan assets as at October 2, 2011.
      ASC 715 requires the funded status of pension plans to be presented on the
      balance sheet by recording the unrecognized
actuarial                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                

P.4

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|GILDAN ACTIVEWEAR INC.                                                                   
|-----------------------------------------------------------------------------------------
|Reconciliation to United States GAAP                                                     
|                                                                                         
|Years ended October 2, 2011, October 3, 2010 and October 4,
      2009                   
|(Tabular amounts
      in thousands or thousands of US dollars, except per share amounts)

Notes to the United States GAAP adjustments (continued):

|(iii) | Defined Benefit Pension Plans (continued)gains
      and losses and prior service cost in accumulated other comprehensive loss.
      As a result, the Company has recorded a pension liability adjustment of
      $2.3 million, net of related taxes, to other comprehensive
  income.
|----- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Adoption of new accounting standards:

Consolidation of Variable Interest EntitiesIn June 2009, the Financial Accounting Standards Board (FASB)
issued Accounting Standards Update (ASU) No. 2009-17 (ASU 2009-17),
(Consolidations Topic 810), Improvements to Financial Reporting by Enterprises
Involved with Variable Interest Entities (VIEs). ASU 2009-17 requires an ongoing
reassessment of determining whether a variable interest gives a company a
controlling financial interest in a VIE. It also requires an entity to
qualitatively, rather than quantitatively, determine whether a company is the
primary beneficiary of a VIE. Under the new standard, the primary beneficiary of
a VIE is a party that has the controlling financial interest in the VIE and has
both the power to direct the activities that most significantly impact the VIEs
economic success and the obligation to absorb losses or the right to receive
benefits that could potentially be significant to the VIE. ASU 2009-17 is
effective for interim and annual reporting periods beginning after November 15,
2009. The Company adopted this standard effective the beginning of fiscal 2011
(October 4, 2010) and the adoption of this standard did not have any impact on
its financial statements.

Future Accounting Standards:

International Financial Reporting StandardsIn February 2008, the Canadian Accounting Standards Board
confirmed that International Financial Reporting Standards (IFRS) as issued by
the International Accounting Standards Board (IASB) will replace Canadian GAAP
for publicly accountable enterprises effective for fiscal years beginning on or
after January 1, 2011. As a result, the Company will be required to change over
to IFRS for its fiscal 2012 interim and annual consolidated financial statements
beginning October 3, 2011 with comparative information for fiscal 2011. In 2008,
the U.S. Securities and Exchange Commission adopted rules to accept filings of
financial statements of foreign private issuers prepared in accordance with IFRS
as issued by the IASB without reconciliation to U.S. GAAP. As a result, a
reconciliation to United States GAAP will no longer be presented for the
Companys consolidated financial statements for fiscal 2012.

P.5

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