Definitions for "Cassock"
A long outer garment formerly worn by men and women, as well as by soldiers as part of their uniform.
A garment resembling a long frock coat worn by the clergy of certain churches when officiating, and by others as the usually outer garment.
A long garment with sleeves, normally black, worn over street clothes when one serves at the altar. It buttons in the front, and should be long enough to cover the ankles. Worn by lay readers, vergers, chalice bearers (and others "serving" during a worship service), and priests; bishops' cassocks are usually purple. ( Photo courtesy - Robert Gaspard Co.)