plain clothes

US /ˌpleɪn ˈkloʊðz/
UK /ˌpleɪn ˈkloʊðz/
"plain clothes" picture
1.

cywilne ubranie, zwykłe ubranie

ordinary clothes, not a uniform or special costume

:
The detective was working in plain clothes.
Detektyw pracował po cywilnemu.
Security personnel often blend in plain clothes at events.
Personel ochrony często wtapia się w cywilne ubrania na imprezach.