[1] : 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
see also:
array 

[2] : WordNet (r) 2.0

raiment
     n : especially fine or decorative clothing syn: array, regalia
     v : provide with clothes or put clothes on; "parents must feed
         and dress their child" syn: dress, clothe, enclothe,
          garb, tog, garment, habilitate, fit out, apparel
         ant: undress
see also:
array regalia dress clothe enclothe garb 
tog garment habilitate fit out apparel 
undress 

[3] : Moby Thesaurus II by Grady Ward, 1.0

70 moby thesaurus words for "raiment":
   apparel, array, attire, bedeck, bedizenment, bedrape, bundle up,
   clad, clothe, clothes, clothing, costume, deck, dight, drape,
   drapery, dress, dressing, dud, duds, enclothe, endue, enrobe,
   enshroud, envelop, enwrap, fashion, fatigues, feathers, fig, frock,
   garb, garment, garments, gear, gown, guise, habiliment,
   habiliments, habilitate, habit, invest, investiture, investment,
   lap, linen, muffle up, rag, rag out, rags, robe, robes, sheathe,
   shroud, sportswear, style, swaddle, swathe, things, threads, tire,
   togs, toilette, trim, vestment, vesture, wear, wearing apparel,
   wrap, wrap up

Raiment >> R Words
Raiment, definition of term: Raiment
raiment_pag1.html