dishabille

noun

1. the state of being dressed only partially or in night clothes
2. Now Rare clothing worn in this state

Etymology: Fr déshabillé, pp. of déshabiller, to undress < dés- (see dis-) + habiller, to dress, altered (after habit: see habit) < OFr abillier, to prepare, orig., to dress a log < bille, log: see billet