Word Study
trews
CIDE DICTIONARY
trews, n. pl.
Trowsers; especially, those of the Scotch Highlanders. Sir W. Scott. [1913 Webster]
OXFORD DICTIONARY
trews, n.pl. esp. Brit. trousers, esp. close-fitting tartan trousers worn by women.
Etymology
Ir. trius, Gael. triubhas (sing.): cf. TROUSERS
For further exploring for "trews" in Webster Dictionary Online