civvies
noun [ plural ] old-fashioned informal uk/ˈsɪv.iz/ us/ˈsɪv.iz/
便装，便服（与制服相对）
ordinary clothes that are not part of a uniform
I didn't realize he was a soldier because he was in civvies. 我没意识到他是军人，因为他穿着便装。
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