plain·clothes ˈplān-ˈklō(t͟h)z
: dressed in civilian clothes while on duty
—used especially of a police officer
: civilian clothes : the dress of an ordinary citizen
—used especially in describing the clothes of a police officer
… he had brought in a stenographer, more cops, and an older man in plain clothes.—
E. L. Doctorow
a detective in plain clothes
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Merriam-Webster unabridged



