Plural of cassock; long, usually black, ankle-length robes worn by clergy and religious officials in Christian churches.
From French casaque, possibly deriving from Turkish/Persian languages via trade routes. The garment became standard ecclesiastical wear across Europe by the Middle Ages.
Cassocks are one of the most durable fashion items in history—priests have worn essentially the same silhouette for 500 years, making it one of the most conservative dress codes still in regular use.
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