The cassock or soutane is a Christian clerical clothing coat used by the clergy and male religious of the Oriental Orthodox Churches, Eastern Orthodox Church and the Catholic Church, in addition to some clergy in certain Protestant denominations such as Anglicans and Lutherans. "Ankle-length garment" is the literal meaning of the corresponding Latin term, vestis talaris. It is related to the habits traditionally worn by nuns, monks, and friars.

A tunic is a garment for the body, usually simple in style, reaching from the shoulders to a length somewhere between the hips and the knees. The name derives from the Latin tunica, the basic garment worn by both men and women in Ancient Rome, which in turn was based on earlier Greek garments that covered wearers' waists.