English

troons

Blend of trousers + pantaloons?

Old Irish tribus

Middle Irish triubus ‘close-fitting shorts’

Proto-Hellenic *pánts

…

Ancient Greek Παντελεήμων

Italian Pantalone

French pantalon ‘trousers (UK), pants (US)’

English pantaloon

Today it means

noun Trousers (pants).

Language periods are conventional ranges, not dates for this word.