What is a button blanket?

What exactly is a button blanket? Besides buttons, its just a normal blanket right? Wrong. A southern button blanket is used mainly for ceremonial purposes, instead of proper sleeping gear. Ceremonies like; Potlatches, Totem Pole raisings, Ceremonial Dances, Naming Ceremonies and Memorials. Button Blankets represent family crests, proclaim rank, and social status in the community.