dalmatic

noun

1. Ecclesiastical. a vestment worn over the alb by the deacon, as at the celebration of the Mass, and worn by bishops on some occasions, as at a coronation.
2. a similar vestment worn by a sovereign of England at his or her coronation.

noun

1. a wide-sleeved tunic-like vestment open at the sides, worn by deacons and bishops
2. a similar robe worn by a king at his coronation