cap-a-pie (adj.)youdaoicibaDictYouDict[cap-a-pie 词源字典]
1520s, from Middle French cap-à-pie, literally "head to foot." The more usual French form is de pied en cap. The French words are from Latin caput "head" (see head (n.)) + pedem "foot" (see foot (n.)).[cap-a-pie etymology, cap-a-pie origin, 英语词源]