The dalmatic is a long wide-sleeved tunic, which serves as a liturgical vestment in the Roman Catholic, Lutheran, Anglican, and United Methodist churches, which is sometimes worn by a deacon at Mass or other services. Although infrequent, it may also be worn by bishops above the alb and below the chasuble. Like the chasuble worn by priests and bishops, it is an outer vestment and is supposed to match the liturgical colour of the day.
A dalmatic is also worn by the British monarch during the Coronation service.
In the Roman Empire, the dalmatic was an amply sleeved tunic with wide stripes (clavi) that were sometimes worked with elaborate designs. Dalmatics had become typical attire for upperclass women in the latter part of the 3rd century AD. They are pictured in a few funerary portraits on shrouds from Antinoopolis in Roman Egypt. Literary sources record dalmatics as imperial gifts to individuals.
The dalmatic was a garment of Byzantine dress, and was adopted by Emperor Paul I of the Russian Empire as a coronation and liturgical vestment. In Orthodox icons of Jesus Christ as King and Great he is shown in a dalmatic.