The Collaborative International Dictionary of English v.0.48:

Trappings \Trap"pings\, n. pl. [From Trap to dress with
   ornaments.]
   1. That which serves to trap or adorn; ornaments; dress;
      superficial decorations.
      [1913 Webster]

            Trappings of life, for ornament, not use. --Dryden.
      [1913 Webster]

            These but the trappings and the suits of woe.
                                                  --Shak.
      [1913 Webster]

   2. Specifically, ornaments to be put on horses.
      [1913 Webster]

            Caparisons and steeds,
            Bases and tinsel trappings.           --Milton.
      [1913 Webster]

WordNet (r) 3.0 (2006):

trappings
    n 1: (usually plural) accessory wearing apparel [syn:
         furnishing, trappings]

Moby Thesaurus II by Grady Ward, 1.0:

110 Moby Thesaurus words for "trappings":
   accessories, accouterments, adornments, appanages, apparatus,
   appendages, appointments, appurtenances, back band, backstrap,
   bearing rein, bellyband, belongings, bit, blinders, blinds,
   bravery, breeching, bridle, caparison, cavesson, checkrein,
   cheekpiece, chiffon, chinband, choses, choses in action,
   choses in possession, choses local, choses transitory, cinch,
   clinquant, collar, crownband, crupper, curb, decorations, equipage,
   equipment, festoons, finery, fittings, folderol, foofaraw,
   frilliness, frilling, frills, frills and furbelows, fripperies,
   frippery, froufrou, furnishings, furniture, fuss, gag swivel,
   gaiety, gaudery, gear, getup, gilding, gilt, gingerbread, girth,
   habiliments, hackamore, halter, hames, hametugs, harness, headgear,
   headstall, hip straps, jaquima, jerk line, lines, livery,
   martingale, material things, movables, noseband, outfit, panoply,
   paraphernalia, paste, perquisites, personal effects, pinchbeck,
   pole strap, raiment, reins, ribbons, rig, saddle, shaft tug,
   side check, snaffle, superfluity, surcingle, tack, tackle, things,
   tinsel, trickery, trousseau, trumpery, tug, turnout, wardrobe,
   winker braces, yoke