The Collaborative International Dictionary of English v.0.48:

Camis \Cam"is\ (k[a^]m"[i^]s), n. [See Chemise.]
   A light, loose dress or robe. [Also written camus.] [Obs.]
   [1913 Webster]

         All in a camis light of purple silk.     --Spenser.
   [1913 Webster] Camisade