Wikipedia
Braccae is the Latin term for trousers, and in this context is today used to refer to a style of trousers, made from wool. The Romans encountered this style of clothing among peoples whom they called Galli ( Gauls). This is often assumed to mean speakers of Celtic languages, though many scholars (including John Collis and Peter S Wells) doubt that the term Galli was primarily based on linguistic affiliation.
Braccae were typically made with a drawstring, and tended to reach from just above the knee at the shortest, to the ankles at the longest, with length generally increasing in tribes living further north.
When the Romans first encountered the braccae, they thought them to be effeminate (Roman men typically wore tunics, which were one-piece outfits terminating at or above the knee).
Usage examples of "braccae".
By the time he was down to the black knit braccae covering his legs and loins, Jane was completely shed of her light summer wear.