To add to the beauty and festivity of the services, and to signify their special ministries, the clergy and other ministers wear vestments. Choir vestments usually consist of an undergown called a cassock (usually black) and a white, gathered overgown called a surplice. The clergy may also wear cassock and surplice.
Another familiar vestment is the alb, a white tunic with sleeves that covers the body from neck to ankles. Over it (or over the surplice) ordained ministers wear a stole, a narrow band of colored fabric. Deacons wear the stole over one shoulder, priests and bishops over both shoulders.
At the Holy Eucharist a bishop or priest frequently wears a chasuble (a circular garment that envelopes the body) over the alb and stole. The deacon's corresponding vestment has sleeves and is called a dalmatic. Bishops sometimes wear a special head covering called a mitre.
Stoles, chasubles, and dalmatics, as well as altar coverings, are usually made of rich fabrics. Their color changes with the seasons and holy days of the Church Year. The most frequently used colors are white, red, violet, and green.