The Collaborative International Dictionary of English v.0.48:

Burnoose \Bur"noose\, Burnous \Bur"nous\, n. [Ar. burnus a kind
   of high-crowned cap: cf. F. bournous, burnous, Sp. al-bornoz,
   a sort of upper garment, with a hood attached.]
   1. A cloaklike garment and hood woven in one piece, worn by
      Arabs.
      [1913 Webster]

   2. A combination cloak and hood worn by women. [Variously
      written bournous, bernouse, bornous, etc.]
      [1913 Webster]