ICS 61.020  
 
Reference number  
DRS 500 -3: 2022  
© RSB 2022 
  
 RWANDA 
STANDARD  DRS 
500-3  
 
First edition  
2022 -mm-dd 
 
Textiles — Garments — Specification — 
Part 3 : Trousers  and shorts  
   
DRS 500 -3: 2022  
©RSB 2022  - 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 2022 
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  
KK 15 Rd, 49  
Tel. +250 788303492  
Toll Free: 3250  
E-mail: info@rsb.gov.rw  
Website: www.rsb.gov.rw  
ePortal: www.portal.rsb.gov.rw   DRS 500 -3: 202 2 
iii                ©RSB 2022  - All rights reserved  
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative reference  ................................ ................................ ................................ ..............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Requirements  ................................ ................................ ................................ ................................ .........  2 
4.1 General requirements  ................................ ................................ ................................ ...........................  2 
4.2 Specific requirements  ................................ ................................ ................................ ...........................  2 
4.2.1  Physical and chemical requirements  ................................ ................................ ................................ .. 2 
4.2.2  Size designation and dimensions  ................................ ................................ ................................ ........  3 
4.2.3  Seams and stitches  ................................ ................................ ................................ ...............................  5 
4.2.4  Hems  ................................ ................................ ................................ ................................ .......................  5 
4.2.5  Securing belt  loops  ................................ ................................ ................................ ...............................  5 
4.2.6  Buttons and  buttonholes  ................................ ................................ ................................ ......................  5 
4.2.7  Outlet allowance  ................................ ................................ ................................ ................................ .... 5 
4.3 Stitches, seams and stitchings  ................................ ................................ ................................ ............  5 
4.3.1  Stitches  ................................ ................................ ................................ .......Error! Bookmark not defined.  
Annex  A (normative) Determination of dimensions of trousers and shorts  ................................ ................  6 
A.1 Principle  ................................ ................................ ................................ ................................ .................  6 
A.2 Apparatus  ................................ ................................ ................................ ................................ ...............  6 
A.3 Sampling  ................................ ................................ ................................ ................................ ................  6 
A.4 Conditioning  ................................ ................................ ................................ ................................ ..........  6 
A.5 Procedure  ................................ ................................ ................................ ................................ ...............  6 
A.6 Calculation and expression of  results  ................................ ................................ ................................  6 
Annex  B (informative) Note to purchasers  ................................ ................................ ................................ ...... 7 
 DRS 500 -3: 2022  
©RSB 2022  - All rights reserved                  iv 
 Foreword   
Rwanda Standard s are prepared  by Technical Committees and approved by Rwanda 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 sta ndards.  
The main task of technical committees is to prepare national standards.  Final Draft Rwanda S tandards 
adopted by Technical committ ees are ratified  by me mbers of RSB Board of Director s for publication and 
gazettment as Rwanda Standards.  
WD nnn-3 was prepared by Technical Committee RSB/TC 029, Textile and Leather Technology . 
WD nnn consists of the following parts, under the general title Textiles — Garments  — Specification : 
⎯ Part 1: General requirements  
⎯ Part 2: Shirts  
⎯ Part 3: Trousers and shorts  
⎯ Part 4: Skirts and dresses  
⎯ Part 5: Jacket  
Committee membership  
The following organizations were represented on the Technical Committee on Textile and leather technology 
(RSB/TC 029) in the preparation of this standard.  
DIKAM Ltd  
GBF Leather and Art promoters Ltd  
Kigali Garment Centre Ltd (KGC)   
Ministry of Trade and Industry (MINICOM)  
Rwanda Inspectorate, Competition and Consumer Protection Authority (RICA)  
Sunbelt textiles Rwanda Ltd  
University of Rwanda -College of Science and Technology (UR -CST) DRS 500 -3: 202 2 
v                ©RSB 2022  - All rights reserved  
 UTEXRWA Ltd  
Rwanda  Standards Board  (RSB) – Secretariat  DRS 500 -3: 202 2 
1                ©RSB 2022  - All rights reserved  
 Textiles — Garments — Specification — Part 2 : Trousers and shorts  
1 Scope   
This Working Draft specifies requirements , sampling  and test methods for trousers and shorts.  
2 Normative reference  
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 references, only the edition cited applies. For undated references, 
the latest edition of the referenced document (including any amendments) applies.  
RS 313, Seams, stit ches and stitching — Nomenclature and classification  
RS ISO 139, Textiles — Standard atmospheres for conditioning and testing  
RS ISO 3801, Textiles — Woven fabrics — Determination of mass per unit length and mass per unit area  
RS ISO 9073 -1, Textiles — Test methods for nonwovens — Part 1: Determination of mass per unit area  
RS ISO 12945 -1, Textiles — Determination of fabric propensity to surface fuzzing and to pilling — Part 1: 
Pilling box method  
ISO 12947 -1, Textiles — Determination of the abrasion resistance of fabrics by the Martindale method —
Part 1: Martindale abrasion testing apparatus  
RS ISO 13934 -1, Textiles — Tensile properties of fabrics — Part 1: Determination of maximum force and 
elongation at maximum force using the strip method  
RS ISO 13 937-1, Fabrics by falling pendulum (Elmendorf) apparatus — Methods for Determination of tear 
resistance of woven  
ISO 13938 -2, Textiles — Bursting properties of fabrics — Part 2: Pneumatic method for determination of 
bursting strength and bursting distension  
3 Terms and definitions   
For the purposes of this standard, the follow ing terms and definitions apply.  
3.1 
trouser  
outer garment covering the body from the waist to the ankles, with equal separate parts for each leg   
©RSB 2022  - All rights reserved                  2 
 3.2 
shorts  
garment worn over th e pelvic area, circling the waist and splitting to cover the upper part of the legs, 
sometimes  extending down to the knees but not covering the entire length of the leg  
4 Requirements  
4.1 General requirements  
4.1.1  The trousers and shorts shall comply with  the requirements specified in DRS 500 -1. 
4.2 Specific requirements  
4.2.1  Physical and chemical requirements  
The trousers and shorts or the fabric used for the manufacture of trousers and shorts shall conform to the 
requirements given in Table 1.  
In addition to the sp ecific r equirement given in DRS 500 -1, trousers and shorts or the fabric used for the 
manufacture of trousers and shorts shall comply with the requirements given in Table 1, when tested in 
accordance with the test methods specified therein.  
Table 1 — Speci fic requirements of fabric used to manufacture trousers  
Parameter  Requirement  Test method  
Mass per unit area, g/m2, min.  190 RS ISO 3801  
Breaking strength, N, 
min. Warp direction  600 RS ISO 13934 -1 
Weft direction  400 
Tear strength (for both directions), N, min.  25 RS ISO 13937 -1 
Bursting strength, kPa, min.  200 ISO 13938 -2 
Abrasion resistance (2000 rubs), min.  No noticeable wear  ISO 12947 -1 
Piling resistance (After 5 h of test), min.  4 ISO 12945 -1 DRS 500 -3: 202 2 
3                ©RSB 2022  - All rights reserved  
  
4.2.2  Size designation and dimensions  
4.2.2.1  A typical shape o f trousers is shown in Figure.1  
 
 
Figure 1 — A typical shape of trousers  
 
Where;  
 
A- Waist circumference/ waist girth  
 B- Seat circumference/hip girth  
C- Inseam length/inside leg length  
 
D- Outseam length/outside leg length  
 
4.2.2.2  The dimensions of trousers of different sizes and designs should conform to the requirements of 
Table 2 and Table 3 when measured by the method specified in Annex A. Unless otherwise, dimensions 
should be agreed upon between the purchaser and the  manufacturer.  
 
 
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 NOTE  The dimensions/sizes given in Table 2 and Table 3 are for guiding the  manufacturer.  
Table 2 — Dimensions of men’s and boys’ trousers and shorts  
Size designation  Waist girth,  
cm Hip girth,  
cm 
24 60 84 
26 65 89 
28 70 94 
30 75 99 
32 80 104 
34 85 109 
36 90 114 
38 95 119 
40 100 124 
42 105 129 
44 110 134 
46 115 139 
48 120 144 
50 125 149 
52 130 154 
54 135 159 
56 140 164 
58 145 169 
60 150 174 
NOTE  These dimensions are based on the British sizing system.  An equivalent of the British 
sizing chart may be  considered.  
Table 3 — Dimensions of women’s and girls’ trousers and shorts  
Size designation  Low waist,  
cm Hip, 
cm 
XXS (4)  74 86 
XS (6)  78 90 
S (8)  82 94 
M (10)  86 98 
L (12)  90 102 
XL (14)  94 106 
XXL (16)  98 110 
NOTE  These dimensions are based on the British sizing system.  An equivalent of the British 
sizing chart may be  considered.  DRS 500 -3: 202 2 
5                ©RSB 2022  - All rights reserved  
 4.2.3  Seams and stitches  
The trousers and shorts shall be assembled with lock/chain stitches regulated at not less than 4 stitches per 
cm. 
4.2.4  Hems  
The bottoms of the regular trousers and shorts may be hemmed. The hem shall be sewn in place with a slip - 
stitch or hemming stitch for turned under or seam binding finishes and a blind stitch for overcast finishes. The 
completed hem shall be inconspicuous from the outside and the raw edges finished securely without bulk.  
4.2.5  Securing belt  loops  
If the trousers are provided with belt loops, the ends of loops shall be reinforced with three rows of stitches or 
securely stitched.  
4.2.6  Buttons and  buttonholes  
4.2.6.1 The buttons shall be stitched with not less than 12 stitches through each pair of hole when sewn 
by machine or 11 stitches of single thread and five stitches of double thread when sewn on by hand. The 
thread shall be wound ro und the st itches six times when single threads or three times when using double 
threads to form a neck. All ends shall be securely  fastened . 
Note  In case of button stitching by machine, the winding of thread around the button to form a neck is not  possible.  
4.2.6.2 The number of stitches on buttonholes shall be not less than 8 per cm when stitching is carried 
out manually and not less than 9 per cm when stitched on machine. Buttonholes shall be bartacked with not 
less than 5 stitches or fish tailed and shall be cleanly cut. All ends of threads shall be securely fastened. The 
length of the buttonhole shall be 0.3 cm greater than the diameter plus the thickness of the  button.  
4.2.7  Outlet allowance  
An outlet allowance of 4 cm in addition to the seam allowanc e shall be provided at the back seat seam near 
the waistline  
4.3  Stitches, seams and stitchings  
NOTE  Stitches and seams are classified and described in RS 313.  
The trousers and shorts shall be assembled with lock/chain stitches regulated at not less than 4 
stitches per cm . 
  
©RSB 2022  - All rights reserved                  6 
 Annex  A 
(normative ) 
Determination of dimensions of trousers and shorts  
A.1 Principle  
Lay a piece of a trousers or shorts  on a flat table removing any curls and without stretching, take the 
measurements from one end to the other using a steel rule. Repeat the procedure for other specimens in the 
laboratory sample.  
A.2 Apparatus  
A.2.1  Flat table  
A.2.2  Steel rule , accuracy of at l east 1 mm  
A.2.3  Calculator  
A.3 Sampling  
From a laboratory sample, take one pair of trousers or shorts  and subject it to conditioning prior to testing.  
A.4 Conditioning  
Condition th e specimen in accordance with RS  ISO 139.  
A.5 Procedure  
Take each trousers or shorts  constituting the test sample. Lay it flat on a table. Remove by hand all creases 
and wrinkles without distorting it. Measure correct to the nearest 0.5 cm the dimensions given in Table 2 or 
Table 3.  
Repeat the procedure for any other specimen that may be requ ired in the laboratory sample.  
A.6 Calculation and expression of  results  
Take the average of the individual measurements and double the result to obtain the dimensions  
 
 
  DRS 500 -3: 202 2 
7                ©RSB 2022  - All rights reserved  
 Annex  B 
(informative ) 
Note to purchasers  
The following requirements shall be specified in tender invitations and in each order or contract:  
a) the type and colour o f the outer material ; 
b) the style;  
c) the size(s) required ; 
d) whether a patch pocket wit h a flap is required ; 
e) whether a laid on buttonhole stand is r equired ; 
f) the design and shape of the pocket s; 
g) the design and shape  of the pocket flaps ; 
h) the style of the back ; 
i) the style of the collar ; 
j) the type of sleeve and th e design of the cuff ; 
k) the type of hem ; and  
l) additiona l marking, if required . 
  
©RSB 2022  - All rights reserved                  8 
 Bibliography  
[1] DUS 1970 -3:2021, Textiles — Garments — Part 3: Trousers and shorts  
 
 
 
 DRS -3: 202 2 
 
Price based on  nnn pages  
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