The Collaborative International Dictionary of English v.0.48:

Disguiser \Dis*guis"er\, n.
   1. One who, or that which, disguises. --Shak.
      [1913 Webster]

   2. One who wears a disguise; an actor in a masquerade; a
      masker. [Obs.] --E. Hall.
      [1913 Webster]