Breeches

[Sarah]

Colonial short-pants, made using a button fly and fastening below the knee, usually worn with stockings. Very manly, back in the day.

[Justin Bieber]

A garment worn by men, covering the hips and thighs;
smallclothes.

[Renato]

trousers that do not cover the whole of the leg:

[Lanell]

Short trousers fastened just below the knee, now chiefly worn for riding a horse or as part of ceremonial dress.