Before cutting, run at least four checks on a specimen from the real lot: shrinkage and spirality after washing, colour fastness to rubbing and washing, measured weight and width, plus a pilling test if the article is brushed or a fibre blend. Cut and sew a few pieces and wash them, so you see real behaviour.
The cost of a small test is negligible compared with an entire run of garments that twist or lose colour. If there are several lots, repeat the tests on each. Keep the results as the basis for any discussion with the supplier.
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