informalDC ordinary clothes, rather than military uniform 便服〔非军服〕
Sam! I didn’t recognise you in civvies.
萨姆,你穿上便服我都认不出你来了!
Examples from the Corpus
civvies• I was going places, thinking and doing things I would never dream of in city civvies.• The early part of the week is the official business bit - clowns in civvies, smoke-filled rooms.• On a Saturday morning there were often more lads down the East End dressed in khaki than in civvies.