plain clothes
US /ˌpleɪn ˈkloʊðz/
UK /ˌpleɪn ˈkloʊðz/

1.
roupas civis, à paisana
ordinary clothes, not a uniform or special costume
:
•
The detective was working in plain clothes.
O detetive estava trabalhando à paisana.
•
Security personnel often blend in plain clothes at events.
O pessoal de segurança frequentemente se mistura à paisana em eventos.