a long piece of clothing, usually black or red, worn by some Christian priests and other people with special duties in a church （基督教会教士等穿的黑或红色的）长袍 Word Originmid 16th cent.: from French casaque ‘long coat’, from Italian casacca ‘riding coat’, probably from Turkic (a large group of Western and Central Asian languages) kazak ‘vagabond’.