trousers

Attested since the 1610s, from the earlier form trouzes (attested since the 1580s), extended from trouse (1570s), with plural ending typical of things in pairs, from Middle Irish triubus (“close-fitting shorts”), from Old Irish tribus, of uncertain origin. The unexplained intrusive second -r- is perhaps due to the influence of drawers. Doublet of trews (“trousers”). Old Irish tribus is probably a borrowing of Anglo-Norman tribuz, trebuz, from Old French trebus, from Old Occitan trebucs, trabucs, from Late Latin trabrugi, tribuces, tubruci (“leg-coverings”), from an early Germanic language, likely Gothic *𐌸𐌹𐌿𐌷𐌱𐍂𐍉𐌺𐍃 (*þiuhbrōks), from Proto-Germanic *þeuhabrōks (“loincloth, trousers”), from Proto-Germanic *þeuhą (“thigh”) + *brōks (“leggings, trousers”), thus making it by surface analysis, thigh + breeches. Cognate with Old High German diohbruoh (“loincloth, trousers”), whence obsolete German Diechbruch (“short legwear, knee breeches, loincloth”).