Yours, Etc.: Origins and Uses of 8 Sign-Offs
ecclesiastical vestment, c.1300, cheisible, from Old French chesible (12c., Modern French chasuble), from Medieval Latin casubla, from Late Latin *casubula, unexplained alteration of Latin casula "a little hut," diminutive of casa "cottage, house" (see casino), used by c.400 in transferred sense of "outer garment." From the notion that hooded garments resembled or suggested little houses. The English form conformed to French from c.1600.
liturgical vestment, the outermost garment worn by Roman Catholic priests and bishops at mass and by some Anglicans and Lutherans when they celebrate the Eucharist. The chasuble developed from an outer garment worn by Greeks and Romans called the paenula or casula ("little house"), a conical or bell-shaped cloak made from a semicircular piece of cloth sewn partially up the front with an opening left for the head