Tartan trousers worn by Scottish regiments (5)

I believe the answer is:

trews

(Other definitions for trews that I've seen before include "nether garments" , "Close-fitting tartan trousers" , "Wrest (anag) - trousers" , "Trousers of a Scot" , "Some clothes" .)

I've seen this clue in The Guardian.

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