The Collaborative International Dictionary of English v.0.48:

Raiment \Rai"ment\ (r[=a]"ment), n. [Abbrev. fr. arraiment. See
   Array.]
   1. Clothing in general; vesture; garments; -- usually
      singular in form, with a collective sense.
      [1913 Webster]

            Living, both food and raiment she supplies.
                                                  --Dryden.
      [1913 Webster]

   2. An article of dress. [R. or Obs.] --Sir P. Sidney.
      [1913 Webster]

WordNet (r) 3.0 (2006):

raiment
    n 1: especially fine or decorative clothing [syn: array,
         raiment, regalia]
    v 1: provide with clothes or put clothes on; "Parents must feed
         and dress their child" [syn: dress, clothe, enclothe,
         garb, raiment, tog, garment, habilitate, fit
         out, apparel] [ant: discase, disrobe, peel,
         strip, strip down, uncase, unclothe, undress]