The cassock, an item of clerical clothing, is a long, close-fitting, ankle-length robe worn by clerics of the Roman Catholic Church, Eastern Orthodox Church, Anglican Church, and some clerics of the Reformed, and Lutheran churches. The cassock derives historically from the tunic that was formerly worn underneath the toga in classical antiquity. The word cassock probably comes from the word "casaque" which means cloak; or cassaca, which means white. In older days, it was known in Latin as vestis talaris.
Although the cassock was formerly the universal everyday clothing of the clergy, many have abandoned it as in favour of a clerical suit of more conventional design. In current usage, wearing of the cassock may be a mark of a traditional cleric; its abandonment, a rejection thereof. In the UK and United States, the black clerical suit remains the norm for Priests, Deacons etc in public ministry, though the use of the cassock remains at their personal discretion and when worn is most often employed in liturgical services.