roman_collar has definitions from the field of clothing
[ noun ] (clothing) a stiff white collar with no opening in the front; a distinctive symbol of the clergy

Used in print

(Edward E. Kelly, S.J., "Christian Unity in England"...)

Since the Protestant clergy for_the_most_part wear gray or some variant from the wholly black suit , my Roman_collar and black garb usually identify me in England as a Roman_Catholic cleric .

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