Others sometimes sit to listen to the organ postlude, which is quite beautiful and inspiring. To add to the beauty and festivity of the services, and to signify their special ministries, the clergy and other worship ministers wear vestments. The clergy wear cassock and surplice during Lent and choir offices. Another familiar garment is the cassock-alb , a white vestment with sleeves. Over it, ordained ministers wear a stole , a narrow band of colored fabric.
Deacons wear the stole over one shoulder, priests and bishops over both shoulders.
Other ministers' corresponding vestments are called dalmatics . Bishops sometimes wear a special head covering called a mitre . Stoles, chasubles, and dalmatics, as well as altar coverings, are usually made of beautiful fabrics. Their color changes with the seasons and holy days of the liturgical year. The most frequently used colors are white, red, blue, green, and purple.