The Collaborative International Dictionary of English v.0.48:

Recherch'e \Re*cher`ch['e]"\ (re*sh[^a]r`sh[asl]"), a. [F.]
   Sought out with care; choice. Hence: of rare quality,
   elegance, or attractiveness; peculiar and refined in kind.
   [1913 Webster]

WordNet (r) 3.0 (2006):

recherche
    adj 1: lavishly elegant and refined [syn: exquisite,
           recherche]

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "recherche":
   braw, breakaway, chic, classy, clothes-conscious, cosmopolitan,
   dainty, dapper, dashing, delicate, dressed to advantage,
   dressed to kill, elegant, exotic, exquisite, fresh, genteel,
   jaunty, natty, neat, new, nifty, nobby, novel, offbeat, original,
   posh, rare, ritzy, select, sharp, sleek, smart, smug, snazzy,
   soigne, soignee, sophisticated, spiffy, spruce, style-conscious,
   sui generis, superior, swank, swanky, swell, tricksy, trig, trim,
   uncommon, uncustomary, undreamed-of, unexpected, unfamiliar,
   unheard-of, unique, unordinary, unthought-of, unusual, unwonted,
   well-dressed, well-groomed