Breeches

Also called knee breeches. knee-length trousers, often having ornamental buckles or elaborate decoration at or near the bottoms, commonly worn by men and boys in the 17th, 18th, and early 19th centuries.
riding breeches.
Informal. trousers.
too big for one’s breeches, asserting oneself beyond one’s authority or ability.
the lower, rear part of the trunk of the body; buttocks.
the hinder or lower part of anything.
Ordnance. the rear part of the bore of a gun, especially the opening and associated mechanism that permits insertion of a projectile.
Machinery. the end of a block or pulley farthest from the supporting hook or eye.
Nautical. the outside angle of a knee in the frame of a ship.
Ordnance. to fit or furnish (a gun) with a breech.
to clothe with breeches.
Historical Examples

Sentimental Education Vol 1 Gustave Flaubert
The Northern Iron George A. Birmingham
Where Art Begins Hume Nisbet
Our Casualty And Other Stories James Owen Hannay, AKA George A. Birmingham
Mr. Wicker’s Window Carley Dawson
Flora Lyndsay Susan Moodie
Lives of the Engineers Samuel Smiles
The Cornwall Coast Arthur L. Salmon
The Varmint Owen Johnson
Humorous Ghost Stories Dorothy Scarborough

plural noun
trousers extending to the knee or just below, worn for riding, mountaineering, etc
(informal or dialect) any trousers
too big for one’s breeches, conceited; unduly self-confident
noun (briːtʃ)
the lower dorsal part of the human trunk; buttocks; rump
the lower part or bottom of something: the breech of the bridge
the lower portion of a pulley block, esp the part to which the rope or chain is secured
the part of a firearm behind the barrel or bore
(obstetrics) short for breech delivery
verb (transitive) (briːtʃ; brɪtʃ)
to fit (a gun) with a breech
(archaic) to clothe in breeches or any other clothing
n.
n.