The Canterbury cap is a square cloth hat with sharp corners. It originated in the Middle Ages, and is commonly found in the Anglican Communion, as well as in the Catholic Church where it is used by Anglican Ordinariate clergy. It is also soft and foldable, "Constructed to fold flat when not in use ..." The Canterbury cap is the medieval biretta, descended from the ancient pileus headcovering. It is sometimes called the "catercap".