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EXHIBIT 99.5

|CERTIFICATION                                   
|------------------------------------------------
|REQUIRED BY RULE 13a-14(b) OR RULE 15d-14(b) AND
|SECTION 1350 OF CHAPTER 63 OF TITLE 18          
|OF THE UNITED STATES CODE                       

Gildan Activewear Inc. (the Corporation) is filing its annual
report on Form 40-F for the fiscal year ended September 30, 2012 (the Report)
with the United States Securities and Exchange Commission.

I, Glenn J. Chamandy, President and Chief Executive Officer of
the Corporation, certify, pursuant to 18 U.S.C. section 1350, as enacted
pursuant to section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of
my knowledge:

|1. | The Report fully complies with the requirements of
      Section 13(a) or 15(d) of the U.S. Securities Exchange Act of 1934;
    and                                
|-- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------
|   |                                                                                                                                                                     
|2. | The information contained in the Report fairly presents,
      in all material respects, the financial condition and results of
      operations of the Corporation.

|Dated: December 7, 2012 |                       |                                      
|----------------------- | --------------------- | -------------------------------------
|                        |                       |                                      
|                        | /s/ Glenn J. Chamandy
|                        | Name:                 | Glenn J. Chamandy                    
|                        | Title:                | President and Chief Executive Officer

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|CERTIFICATION                                   
|------------------------------------------------
|REQUIRED BY RULE 13a-14(b) OR RULE 15d-14(b) AND
|SECTION 1350 OF CHAPTER 63 OF TITLE 18          
|OF THE UNITED STATES CODE                       

Gildan Activewear Inc. (the Corporation) is filing its annual
report on Form 40-F for the fiscal year ended September 30, 2012 (the Report)
with the United States Securities and Exchange Commission.

I, Laurence G. Sellyn, Executive Vice-President, Chief
Financial and Administrative Officer of the Corporation, certify, pursuant to 18
U.S.C. section 1350, as enacted pursuant to section 906 of the Sarbanes-Oxley
Act of 2002, that, to the best of my knowledge:

|1. | The Report fully complies with the requirements of
      Section 13(a) or 15(d) of the U.S. Securities Exchange Act of 1934;
    and                                
|-- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------
|   |                                                                                                                                                                     
|2. | The information contained in the Report fairly presents,
      in all material respects, the financial condition and results of
      operations of the Corporation.

|Dated: December 7, 2012 |                        |                                              
|----------------------- | ---------------------- | ---------------------------------------------
|                        |                        |                                              
|                        | /s/ Laurence G. Sellyn
|                        | Name:                  | Laurence G. Sellyn                           
|                        | Title:                 | Executive Vice-President, Chief Financial and
|                        |                        | Administrative Officer                       

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