The Collaborative International Dictionary of English v.0.48:

Dishabille \Dis`ha*bille"\, n. [See Deshabille.]
   An undress; a loose, negligent dress; deshabille.
   [1913 Webster]

         They breakfast in dishabille.            --Smollett.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dishabille
    n 1: the state of being carelessly or partially dressed [syn:
         dishabille, deshabille]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "dishabille":
   bathrobe, bed jacket, brunch coat, casual clothes, dressing gown,
   housecoat, kimono, lounging robe, morning dress, neglige, negligee,
   robe, robe-de-chambre, smoking jacket, something comfortable,
   sport clothes, undress, wrap, wrapper