Green’s Dictionary of Slang

a state of undress.

1811		O. Neville Lay of the Last Minstrel, Travesty 176: Behind the Giant and the Dame, / Sweet Molly in her dickey [...] came, / Her slippers on her feet; / Red was a pimple on her nose; / Unwashed her face, we will suppose; / En dishabilly neat.
1824		Amer. Mthly Mag. (Phila., PA) Mar. 228: ‘Mrs. Drubbs — why I do say, it will make an excellent dishabilly.’ ‘I think it is not so kind of you Mrs. Trumpery, to call my torn frock an excellent dishabilly’.
1844		Ernest Mountjoy 9: Why, sir, I don’t think she’ll like to come in, for, said she, I’d rather not enter, I’m in a “dish-abilly;” that kind of a Spanish black veil she wears sometimes, sir,.
1850		Sartain’s Union Mag. (Phila., PA) Mar. 215/1: Well, aren’t you going to dress yourself? Mercy on me, if you appear before them in that dishabilly, the poor things will think you are Valentine and Orson.
1866		C.S. Cheltenham Ticketof-leave Man’s Wife 21: Excuse me for keeping you so long on the landing, Finch; but, the fact is, I'm ong dishabilly.
1894		East Anglian N&Q 153: ‘I was all in my dishabilly,’ i.e. dirty and stripped; for work.
1937–84		Partridge DSUE (1984) 314/1: from ca. 1700.