The Collaborative International Dictionary of English v.0.48:

Smock \Smock\, a.
   Of or pertaining to a smock; resembling a smock; hence, of or
   pertaining to a woman.
   [1913 Webster]

   Smock mill, a windmill of which only the cap turns round to
      meet the wind, in distinction from a post mill, whose
      whole building turns on a post.

   Smock race, a race run by women for the prize of a smock.
      [Prov. Eng.]
      [1913 Webster]