civilian clothes;plain clothes;(身着便衣执行任务的军人和侦探) plainclothesman;civvy;fly cop ;

The information study should be the precondition for plainclothes detection.
实施便衣侦查,应以情报信息研判为前提.
来源:互联网摘选He was arrested by plain-clothes detectives as he walked through the customs hall.
他穿过海关大厅时被便衣侦探逮捕。
来源:《柯林斯高阶英汉双解学习词典》The Sarcastic Bystander: There! I knowed he was a plain-clothes copper.
讽刺的旁观者: 你瞧! 我早知道他是便衣警察.
来源:互联网摘选A couple of plain-clothes men had been sniffing round his apartment.
几名便衣男子一直在他的公寓周边打探。
来源:《柯林斯高阶英汉双解学习词典》
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