Meaning of the word "plain clothes" in English

What does "plain clothes" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

plain clothes

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

Noun

1.

ordinary clothes, not a uniform or special costume

Example:
The detective was working in plain clothes.
Security personnel often blend in plain clothes at events.
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