The Collaborative International Dictionary of English v.0.48:

Clothier \Cloth"ier\, n.
   1. One who makes cloths; one who dresses or fulls cloth.
      --Hayward.
      [1913 Webster]

   2. One who sells cloth or clothes, or who makes and sells
      clothes.
      [1913 Webster]

WordNet (r) 3.0 (2006):

clothier
    n 1: a merchant who sells men's clothing [syn: clothier,
         haberdasher]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "clothier":
   antique store, apothecary, automobile showroom, bookstore, bootery,
   candy store, chemist, cigar store, clothiers, clothing store,
   confectionery, costumer, costumier, draper, dress shop, drugstore,
   dry goods dealer, dry goods store, florists, fur salon,
   furniture store, furrier, gift shop, glover, haberdasher,
   haberdashery, hardware store, hat shop, hobby shop, hosier,
   ironmongery, jewelers, jewelry store, leather goods store,
   liquor store, luggage shop, mercer, milliners, novelty shop,
   package store, pharmacy, saddlery, schlock house, schlock shop,
   secondhand shop, secondhand store, shoe store, smoke shop,
   specialty shop, sporting goods store, stationers, stationery store,
   sweater shop, sweet shop, thrift shop, tobacco store, tobacconists,
   toy shop, trimming store, used-car lot