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]

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "clotheshorse":
   Beau Brummel, arbiter of fashion, beau, blade, blood, boulevardier,
   buck, clubman, clubwoman, coxcomb, dandy, deb, debutante, dude,
   exquisite, fashion plate, fashionable, fine gentleman, fop,
   fribble, gallant, horse, jack-a-dandy, jackanapes, lady-killer,
   macaroni, man-about-town, masher, mondain, mondaine, puppy,
   sawbuck, sawhorse, socialite, spark, sport, subdeb, subdebutante,
   swell, swinger, taste-maker, tone-setter, trend-setter, trestle,
   trestle and table, trestle board, trestle table, trestlework,
   trestling