Reference number  
DRS 374: 2017  
© RBS yyyy 
© RSB 2017  
 
 RWANDA 
STANDARD  DRS 
374 
 
First edition  
2017 -mm-dd 
 
Ladies ’ Panties  — Specification   
  DRS 374: 2017  
©RSB 2017  All rights reserved                  ii 
 
 In order to match with technological development and to keep continuous progress in industries, 
Standards are subject to periodic review. Users shall ascertain that they are in possession of the latest 
edition  
 
 
 
 
 
 
 
 
 
 
© RSB 2017  
All rights reserved. Unless otherwise specified , no part of this publication may be reproduced or utilized 
in any form or by any means, electronic or mechanical, including photocopying and microfilm, without 
prior written permission from R SB. 
Requests for permission to reproduce this document should be  addressed to  
Rwanda Standards  Board  
P.O Box 7099 Kigali -Rwanda  
Tel. +250 252 586103/ 582945  
E-mail: info@rsb.gov.rw  
Website: www.rsb.gov.rw  DRS 374: 2017  
iii                 ©RSB 2017  All rights reserved  
 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4. Quality Requirements  ................................ ................................ ................................ ................................ .... 2 
4.1 General Requirements  ................................ ................................ ................................ ................................ . 2 
4.1.1 Manufacture  ................................ ................................ ................................ ................................ ...............  2 
4.1.2 Freedo m from Defects  ................................ ................................ ................................ ..............................  2 
4.1.3 Materials  ................................ ................................ ................................ ................................ .....................  2 
4.1.4 Seams and Stitches ................................ ................................ ................................ ................................ ... 3 
4.2 Specific requirements  ................................ ................................ ................................ ................................ .. 3 
4.2.1 Dimensions  ................................ ................................ ................................ ................................ ................  3 
5. Packing  ................................ ................................ ................................ ................................ ...................  4 
6. Marking  ................................ ................................ ................................ ................................ ...................  4 
7. Sampling and Ac ceptance Criteria  ................................ ................................ ................................ ...............  5 
7.1 Sampling  ................................ ................................ ................................ ................................ .......................  5 
7.2 Acceptance Criteria  ................................ ................................ ................................ ................................ ...... 5 
Annex  A (normative)  METHODS OF TEST FOR DIMENSIONS  ................................ ................................ ..... 6 
 DRS 374: 2017  
©RSB 2017  All rights reserved                  iv 
 
 Foreword  
Rwanda Standard s are prepared  by Technical Committees and approved by R wanda Standards Board (RSB) 
Board  of Directors in  accordance with the procedures of RSB, in compliance with Annex 3 of the WTO/TBT 
agreement on the preparation, adoption and application of standards.  
The main task of technical committees is to prepare national standards.  Final Draft Rwanda S tandards 
adop ted by Technical committ ees are ratified by me mbers of RSB Board of Director s for publication and 
gazettment as Rwanda Standards.  
DRS 374 was prepared by Technical Committee RSB/TC 029, Textiles and Leather Engineering ,  
In the preparation of this standard , reference was made to the following standard s: 
IS 14320: 1995 Textiles  - Plain knitted ladies' cotton  panties  - Specification  
2) KS 08 -495: 1983  Specification for gent’s knitted briefs  
The assistance de rived from the above source is hereby acknowledged with thanks.  
Committee membership  
The following organizations were represented on the Technical Committee on Textiles and Leather 
Engineering  (RSB/TC 029) in the preparation of this standard.  
 
PARTICIPANTS  
Rwanda  Standards Board  (RSB) – Secretariat  
 DRS 374: 2017  
1                 ©RSB 2017  All rights reserved  
 
 Ladies` Panties  — Specification  
1 Scope  
This draft Standard prescribes the requirements , sampling and test method of ladies’ panties . It applies to all 
types of panties for girls and women.  
2 Normative references  
The following documents are referred to in the text in such a way that some or all of  their content constitutes 
requirements of this document.  For dated refere nces, only the edition  cited applies. For undated references, 
the latest edition of the referenced document (including any amendments) applies.  
ISO 3071  Textiles  — Determination of pH of aqueous extract  
BIS IS 1383  Methods For Determination Of Scouring Los s In Grey And Finished Cotton Textile Materials  
ISO 105-B01 Textiles  — Tests for colour fastness  — Part B01: Colour fastness to light: Daylight  
 ISO 11641  Leather  — Tests for colour fastness  — Colour fastness to perspiration  
 ISO 105-C10 Textiles  — Tests for colour fastness  — Part C10: Colour fastness to washing with soap or 
soap and soda  
ISO 105 -X12 Textiles — Tests for colour fastness — Part X12: Colour fastness to rubbing  
3 Terms and definitions  
For the purposes of this standard, the following terms and d efinitions apply  
3.1  
panties /briefs  
tight fitting underwear for ladies without leg portion.  
3.2 
lot 
In any consignment, all the panties of same size and manufactured from plain knitted fabric of same count of 
yarn knitted on machine of same gauge and delivered to a buyer against one despatch note shall constitute a 
lot.  
©RSB 2017  All rights reserved                  2 
 
 4 Quality  Requirements  
4.1 General Requirements  
4.1.1  Manufacture  
4.1.1. 1 The briefs shall be supplied with an elastic braid which shall be accommodated by folding and/or stitching 
the knitted fabric at the waist band.  
 
4.1.1. 2 An elastic fabric having a width of not less than 12 mm shall be used at the thigh openings to provide a 
better fit.  
 
4.1.2 Freedom from Defects  
4.1.2. 1 The briefs shall be free from any manufacturing defects such as darn ing, mends, ladders, dropped 
stitches, holes, cuts, missing stitches at the stitched parts and stains.  
4.1.2. 2 The briefs shall contain no harmful ingredients that may cause irritation to the skin or are known to be 
harmful to the skin.   
4.1.3 Materials  
4.1.3. 1 Fabrics  
4.1.3.1. 1 The knitted fabrics from which the briefs are manufactured shall be scoured, bleached, dyed or 
printed and shall  conform to construction particulars given in figure 1 . 
 
Figure 1  
4.1.3.1. 2  The elastic flat braids used in the making up of the  panties shall comply with the requirements of 
the fabric.   
DRS 374: 2017  
3                 ©RSB 2017  All rights reserved  
 
 4.1.3. 2 Sewing Threads  
4.1.3.2. 1 The sewing threads used for stitching various parts of briefs shall comply with the relevant 
requirements  for sewing threads.   
4.1.3.2. 2 All other materials used for making up the briefs shall be as durable as the briefs themselves.   
4.1.4  Seams and Stitches  
4.1.4.1 The joining of the seat shall be done with overlock and/or flat -lock stitches while the side seams shall 
be done with overlock or chain stitch with overlock. The hemmings at the waist band and thigh  openings shall 
be done with 2 thread overlock stitches or flat -lock stitches.  
4.1.4.2 The number of stitches shall be not less than 3.5 per centimeter . 
4.2 Spec ific requirements  
4.2.1 Dimensions  
The dimensions of briefs when measured by the method prescribed in A1 shall comply with the requirements 
given in Table 1.  
Table 1— Dimensions  of ladies’ knitted briefs  
  
SIZE   
WIDTH ACROSS WAIST  
(See Note 2)  
(cm)   
WIDTH ACROSS SEAT  
(HIP)  
(cm)  
 
i.   
40  
20.0  
7.0 
ii.  45 22.5 9.0 
iii.  50 25.0 11.0 
iv.  55 27.5 13.0 
v.  60 30.0 15.0 
vi.  65 32.5 17.0 
vii.  70 35.0 19.0 
viii.  75 37.5 21.0 
ix.  80 40.0 21.0 
x.  85 42.5 23.0 
xi.  90 45.0 23.0 
xii.   
Tolerance   
± 1.5   
± 1  
©RSB 2017  All rights reserved                  4 
 
  
NOTES : 1. Size of the brief is denoted  by a number which is the hip (seat) measurement for the Panty in 
centimetres.  
2. The dimensions of both thigh openings shall be equal subject to a tolerance of ±1 cm.  
 
 
Introductory sentence  
Table 2  —: Requirements of Panties  
Characteristics  Requirement  Method of Test  
Dimensional change due to relaxation 
(both direction), percent, Mar  5  Annex A  
Scouring loss percent, Ma x 2 BIS IS 1383  
pH value of aqueous extract  6 to 8 ISO 3071  
Colou r fastness of dyed briefs to:  
a) Light  ≥4  ISO 105-B01 
b) Washing test:  
Change in colour  
Staining on adjacent fabric   
≥3  ISO 105-C10 
c) Perspiration  
Change in colou r 
Staining on adjacent fabric   
≥4  
 ISO 11641  
d) Rubbing (wet and dry ) ≥4  ISO 105 -X12 
5 Packing  
The briefs shall be  packed in a  package protecting them from dust, dirt and water.  
6 Marking  
Each brief shall bear a label, sewn on the inside of the brief on which the following particulars shall be clearly 
and durably be marked:  
a) Manufacturer’s name or trade mark;  
b) Size;  
c) Care instructions   
d) Fibre composition  
e) Country of Origin  DRS 374: 2017  
5                 ©RSB 2017  All rights reserved  
 
 7 Sampling and Acceptance Criteria  
7.1 Sampling  
Sampling shall be done as per Table 3  
Table 3  — Sample Size and Permissible Number of Non -Conforming Briefs  
Number of Briefs in the 
Lot Physical characteristics  Number of Brief s lo be 
Inspected  
Number of Briefs’ to be 
Inspected  Permissible Number of 
Non-Conforming Briefs  
Upto  300 
 301 to 500  
 501 to 1000  
 1001 and above  10  
20  
32  
 50  0 
1 
3 
5 3 
5  
5  
8 
7.2 Acceptance Criteria  
The number of briefs to be tested and criterion for conformity for each of the characteristics shall be as 
follows:   
Characteristic  Number of Drawers to be Tested  
7.2.1   Criterion for Conformity  
Freedom from defects, wales and 
courses and dimensions  See co1 2 of Table 3 Non-conforming briefs not t o exceed 
the corresponding num ber given in 
co1 3 of Table 3 
Dimensional change, scouring Ioss , 
pH value of aqueous extract  See co1 4 of Table  3 All the briefs to satisfy the relevant 
requirements  
Colours fastness  1 each of the same colour shade and 
for lot size up to 500 and 2 above 
500. All the test specimens to satisfy the 
relevant requirements  
  
©RSB 2017  All rights reserved                  6 
 
 Annex  A 
(normative)  
 
Methods of test  for dimensions  
A.1 Conditioning of test .specimens and atmospheric conditions for testing  
The test specimens shall be tested in prevailing  atmospheric conditions. In case of dispute, the  samples shall 
be conditioned and tested in the  standard atmosphere as given in IS O …  
A.2 Dimensions  
Procedure  
Take each garment constituting the test sample. Lay it flat on a table. Remove by hand all creases and 
wrinkles without distorting it. Measure to the nearest 0.5 cm the dimensions given  
A.3 Dimensional changes due to relaxation  
A.3.1 Marking  of Test Specimens  
A.3.1.1  Take a brief from the test sample. Cut from it a test specimen measuring approximately 20 cm x 20 
cm in such a way that the two of its sides are parallel in the direction of wales and the other two parallel in the 
direction of c ourses. Mark the direction of wales and courses in the test specimen.  
A.3.1.2  Mark centrally on the test specimen by means of indelible ink or a fast dyed cotton sewing thread an 
area 10 cm x 10 cm with two of its sides in the direction of wales and the o ther two in the direction of courses. 
Spread this test specimen on a flat smooth surface. Carefully remove by hand all creases and wrinkles. Within 
this area, mark six pairs of marks, three pairs each in the wales direction and the courses direction in suc h 
way that the distance between each pair of marks is the same.  
A.3.2 Procedure  
A.3.2. 1 Place test specimen on a glass plate and carefully remove by hand all creases and wrinkles without 
distorting it and place the other glass plate on the test specimen. Measure, correct to the nearest millimetre, 
the distance between each pair of marks separ ately.  
A.3.2. 2 Lay the test specimen flat in a tray of suitable size and of depth minimum 10 cm. Soak it under a 
head of 25 mm of water containing 0.5 percent suitable wetting agent at room temperature for 2 hours. Drain 
out the water and remove the test specimen carefully so that it is not stretched and lay it flat on a smooth 
surface. Remove the excess of water by an absorbent material and dry it at room temperature.  
A.3.2.3 After drying condition the test specimen to moisture equilibrium at room tempera ture. Place it on the 
glass plate. Carefully remove all wrinkles and creases and place the other glass plate on the test specimen. 
Measure, correct to the nearest millimetre, the distance between each pair of marks separately.  DRS 374: 2017  
7                 ©RSB 2017  All rights reserved  
 
 A.3.3 Calculation  
A.3.3. 1 Calculate separately the percentage of dimensional change both in the direction of wales and in the 
direction of courses by the following formula:  
S = 100 x (a - b)/ a  
where  
S = dimensional change, percent;  
a = the distance between a pair of marks (alon g the wales or courses as the case may be) before soaking; 
and b = the distance between the same pair of marks after soaking.  
A.3.2.2 Calculate separately the dimensional change between all the three pairs of marks in the direction of 
wales and in the dir ection of courses and calculate the average dimensional change in each direction.  
 
 
 
 
 DRS 374: 2017  
ICS 59.080.30  
 
©RSB 2017  All right s reserved