The rubrics (regulations) for the type of vestments to be worn vary between the various communions and denominations. In some, clergy are directed to wear special clerical clothing in public at all, most, or some times. This generally consists of a clerical collar, clergy shirt, and (on certain occasions) a cassock. In the case of members of religious orders, non-liturgical wear includes a religious habit. This ordinary wear does not constitute liturgical vestment, but simply acts as a medium of identifying the wearer as a member of the clergy or a religious order.