Because jeans usually shrink after washing, they must be added to the size of the guests before washing.

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The specific shrinkage rate can be as follows:

Cut a half yard cloth, use butter pen or ball point pen (after washing the water without legs). Draw a horizontal X straight =50cmX50cm box to wash the water according to the standard of washing water (must be the same as the future).

It is a standard for washing water.

After washing the water, you can get the shrinkage by measuring the size of the box. For example, after washing the water, it is X straight =47cmX48cm, then the contraction is (50-47) /50=6%, and the contraction is (50-48) /50=4%.

And then

For example, the waist should be cross cut and the guest size is 32. Then the size of the pattern should be 32 "/ (1-6%) =34" (because the waist is 34 before washing). After washing the water, the size is 34 "X94%=32", which is just the guest's request.