This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Ecclesiastical An ankle-length garment with a close-fitting waist and sleeves, worn by the clergy and others assisting in church services.

n. A long outer garment formerly worn by men and women, as well as by soldiers as part of their uniform.

n. A garment resembling a long frock coat worn by the clergy of certain churches when officiating, and by others as the usually outer garment.

n. Any loose robe or outer coat, but particularly a military one.

n. A long clerical coat, buttoned over the breast and reaching to the feet, and confined at the waist by a broad sash called a circline.

n. a black garment reaching down to the ankles; worn by priests or choristers

"I find thought that the cassock is as much a reminder to me of my call as a sign for others."

vestment   

soutane   

doublet    smock    gaiter    tippet    serge    cowl    surcoat    greatcoat    surplice    raincoat