Source : Webster's Revised Unabridged Dictionary (1913)

Blouse \Blouse\ (blouz; F. bl[=oo]z), n. [F. blouse. Of unknown
   origin.]
   A light, loose over-garment, like a smock frock, worn
   especially by workingmen in France; also, a loose coat of any
   material, as the undress uniform coat of the United States
   army.

Source : WordNet®

blouse
     n : a top worn by women