Breeching (tack)

Harness breeching
Breeching on a horse in a light cart

Breeching (/ˈbrɪɪŋ/ "britching") is a strap around the haunches of a draft, pack or riding animal. Both under saddle and in harness, breeching engages when an animal slows down or travels downhill and is used to brake or stabilize a load.