breeches

/B R IY1 CH IH0 Z/
noun
  1. 1

    (now only in the plural) A garment whose purpose is to cover or clothe the buttocks.

  2. 2

    The buttocks or backside.

  3. 3

    The part of a cannon or other firearm behind the chamber.

  4. 4

    The external angle of knee timber, the inside of which is called the throat.

  5. 5

    A breech birth.

noun
  1. 1

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

  2. 2

    Trousers; pantaloons.

Source: https://en.wiktionary.org/wiki/breech, https://en.wiktionary.org/wiki/breeches