Etymology
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plain clothes (n.)

"ordinary dress of civil life" (as opposed to military uniform), 1822; in reference to police detectives, it is attested from 1842. Also plainclothes.

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Definitions of plain clothes

plain clothes (n.)
ordinary clothing as distinguished from uniforms, work clothes, clerical garb, etc.;
Synonyms: civilian clothing / civilian dress / civilian garb
From wordnet.princeton.edu

Dictionary entries near plain clothes

plague

plaguey

plaice

plaid

plain

plain clothes

plain Jane

plainly

plainness

Plains

plainsman