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

1.
pakaian biasa, pakaian awam
ordinary clothes, not a uniform or special costume
:
•
The detective was working in plain clothes.
Detektif itu bekerja dengan pakaian biasa.
•
Security personnel often blend in plain clothes at events.
Anggota keselamatan sering menyamar dengan pakaian biasa di acara-acara.