cassock

noun

1. An item of clerical clothing: a long, sheath-like, close-fitting, ankle-length robe worn by clergy members of some Christian denominations.

   “It was a joy to snatch some brief respite, and find himself in the rectory drawing–room. Listening here was as pleasant as talking; just to watch was pleasant. The young priests who lived here wore cassocks and birettas; their faces were fine and mild, yet really strong, like the rector's face; and in their intercourse with him and his wife they seemed to be brothers.”

   “In one of the aisles there was an elaborately carved confessional box and I recognised the village priest in his heavy mountain boots and black cassock as he entered it and drew the dark velvet curtains behind him.”

   “When leading worship, Elsie usually wore a long black cassock and preaching bands. This would, of course, save her from the worry of choosing a suitable costume.”

2. (obsolete)A military cloak or long coat worn by soldiers or horsemen in the 16th and 17th centuries.
3. (obsolete)A coarse, loose cloak or gown, worn by women, sailors, shepherds, countryfolk etc.