в штатском

in plain clothes

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phrase Rare #46,885

in plain clothes Used when someone is not wearing a uniform, especially a police officer, soldier, or other official.

RU: Полицейский был в штатском и наблюдал за входом.

EN: The police officer was in plain clothes and was watching the entrance.

In plain clothes!

— Таксист (2017)

They are soldiers in plainclothes!

— Таксист (2017)

He looked at me as if he were an undercover officer!

— Конформист (1971)