The word is cognate with the English breeches. It appears to derive from the Indo-European root - "break", here apparently used in the sense "divide", "separate", as in Scottish Gaelic  ("trousers"), in Breton  ("pants"), in Irish  ("trousers")  and  in Welsh.
The word shares a linguistic connection with "breeches"; it likely stems from an Indo-European root meaning "break," which implies division or separation, similar to Scottish Gaelic ("trousers"), Breton ("pants"), Irish ("trousers"), and Welsh.