The Collaborative International Dictionary of English v.0.48:

Haberdasher \Hab"er*dash`er\ (h[a^]b"[~e]r*d[a^]sh`[~e]r), n.
   [Prob. fr. Icel. hapurtask trumpery, trifles, perh. through
   French. It is possibly akin to E. haversack, and to Icel.
   taska trunk, chest, pocket, G. tasche pocket, and the orig.
   sense was perh., peddler's wares.]
   1. A dealer in small wares, as tapes, pins, needles, and
      thread. [Obs.]
      [1913 Webster]

   2. A dealer in items of men's clothing, such as hats, gloves,
      neckties, etc.
      [1913 Webster]

            The haberdasher heapeth wealth by hats. --Gascoigne.
      [1913 Webster]

   3. A dealer in drapery goods of various descriptions, as
      laces, silks, trimmings, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "haberdasher":
   baker, bookdealer, bookseller, butcher, chandler, clothier,
   clothing merchant, confectioner, costumer, costumier, draper,
   dry goods dealer, drysalter, fishmonger, fishwife, florist,
   footwear merchant, fruiterer, furnisher, furrier, glover,
   greengrocer, grocer, groceryman, hardwareman, hosier, ironmonger,
   jeweler, liquor merchant, mercer, newsdealer, perfumer, poulterer,
   saddler, stationer, tobacconist, vintner, wine merchant