PLAIN-CLOTHES Meaning of PLAIN-CLOTHES in English plain-clothes BrE AmE ˌpleɪn ˈkləʊðz ◂ ⇨ˌpleɪŋ-, -kləʊz AmE \ -ˈkloʊz -ˈkloʊðz Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012