Play word 直衣 直衣 ちょくい everyday robes worn by males of the imperial family, nobility, etc. (from the Heian period onward)
Play word 布衣始 布衣始 ほういはじめ ceremony in which an abdicated emperor puts on informal court clothes (i.e. a kariginu and eboshi) for the first time
Play word 便衣隊 便衣隊 べんいたい plain-clothes soldiers (esp. of the Chinese Army during the Second Sino-Japanese War)