[1] 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.
For the Romans, to encircle the legs and thighs with fasciae, or bands, was understood, in the time of Pompey and Horace, to be a proof of ill health and effeminacy.
[2] Roman men typically wore tunics, which were one-piece outfits terminating at or above the knee.
The word originates from the Gaulish bhrāg-ikā, after going through a process of syncopation it gave rise to braca "trouser, pants".
The Celtic form may have first passed to the Etruscan language, which did not distinguish between the [k] and [ɡ] sounds.