Plain clothes may refer to:
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Plainclothes law enforcement
To go "undercover" (that is, to go on an undercover operation) is to avoid detection by the object of one's observation, and especially to disguise one's own identity (or use an assumed identity) for the purposes of gaining the trust of an indi ...
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Plain Clothes (1925 film), a silent black and white short American film
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''Plain Clothes'' (1988 film), an American comedy film
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Plain Clothes Theatre Productions, a theatre company based in Bristol, England
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''Plainclothes'' (TV series), a 1990s New Zealand crime drama series
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Plain dress, a religious practice of wearing clothes of traditional, modest design
{{disambiguation