clothing worn by someone who is not in uniform, typically used by law enforcement officers or detectives.

गोपनीय कपड़े

English Usage: The detective was in plainclothes to avoid being recognized while investigating the case.

Hindi Usage: जासूस गुप्त कपड़ों में था ताकि मामले की जांच करते समय पहचाना न जाए।