Hard-wearing twill-weave cotton fabric used for trousers and work clothes (5)

I believe the answer is:

denim

(Other definitions for denim that I've seen before include "Twilled cotton fabric" , "Material for casual trousers or jackets" , "Coarse durable twill-weave cotton fabric" , "Cloth for jeans, etc" , "Hard-wearing blue fabric" .)

I've seen this clue in The Mirror.

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