The Collaborative International Dictionary of English v.0.48:

Clotheshorse \Clothes"horse`\ (kl[=o]z"h[^o]rs`), n.
   1. A frame to hang clothes on.
      [1913 Webster]

   2. a person who is conspicuous for dressing fashionably,
      especially one who spends much time or money to acquire
      clothing.
      [PJC]

WordNet (r) 3.0 (2006):

clotheshorse
    n 1: a framework on which to hang clothes (as for drying)
    2: a man who is much concerned with his dress and appearance
       [syn: dandy, dude, fop, gallant, sheik, beau,
       swell, fashion plate, clotheshorse]