Plural of clerical; clergy members, or more commonly, garments worn by clergy members.
From clerical (from Latin clericus, meaning 'ordained official') plus -s for pluralization. The term can refer both to people and to the distinctive black or white religious vestments they wear.
In fashion and church supply terminology, 'clericals' specifically means those distinctive black shirts or collars that instantly identify someone as clergy—making it a word that's equally about fashion as it is about religion.
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