The Collaborative International Dictionary of English v.0.48:

Outfitter \Out"fit`ter\, n.
   One who furnishes outfits for a voyage, a journey, or a
   business.
   [1913 Webster]

WordNet (r) 3.0 (2006):

outfitter
    n 1: someone who sells men's clothes
    2: a shop that provides equipment for some specific purpose; "an
       outfitter provided everything needed for the safari"