The alb (Latin albus, 'white') is an ecclesiastical vestment of some of the Western Churches, including the Anglicans, Lutherans, Methodists and Roman Catholics. It is used by all levels of the Catholic clergy. It is generally worn over the cassock, and under the chasuble or dalmatic and is usually girdled with a cincture. It derives from the Roman-period, long-sleeved tunica alba, which in the Roman Empire was worn by the well-to-do.