The Collaborative International Dictionary of English v.0.48:

Outfit \Out"fit\, n.
   1. A fitting out, or equipment, as of a ship for a voyage, or
      of a person for an expedition in an unoccupied region or
      residence in a foreign land; the expense of, or allowance
      made for, equipment, as by the government of the United
      States to a diplomatic agent going abroad.
      [1913 Webster]

   2. Hence: Any assemblage of objects required for or used in
      performing a task; things required as equipment for a
      task.
      [PJC]

   3. A complete ensemble of clothing, selected to form a
      matching set; a coordinated costume; as, a new Easter
      outfit.
      [PJC]

   4. A business enterprise; as, what outfit do you work for?.
      [informal]
      [PJC]

   5. Any team or party of people.
      [PJC]

WordNet (r) 3.0 (2006):

outfit
    n 1: any cohesive unit such as a military company
    2: a set of clothing (with accessories); "his getup was
       exceedingly elegant" [syn: outfit, getup, rig,
       turnout]
    3: gear consisting of a set of articles or tools for a specified
       purpose [syn: kit, outfit]
    v 1: provide with (something) usually for a specific purpose;
         "The expedition was equipped with proper clothing, food,
         and other necessities" [syn: equip, fit, fit out,
         outfit]

Moby Thesaurus II by Grady Ward, 1.0:

181 Moby Thesaurus words for "outfit":
   KP, accouter, accouterments, age group, apparatus, appliances,
   appoint, appointments, appurtenances, arm, armament, army,
   army group, attire, bag and baggage, baggage, ballet skirt, band,
   battalion, battery, battle group, bevy, block, body, brigade,
   bunch, business, buskin, cabal, cadre, camarilla, cap and bells,
   caparison, cast, cell, charmed circle, circle, clan, clique,
   closed circle, clothes, clothing, cohort, column, combat command,
   combat team, company, complement, concern, contingent,
   conveniences, corporation, corps, costume, coterie, covey, crew,
   crowd, detachment, detail, disguise, division, dress, duffel,
   dunnage, elite, elite group, ensemble, equip, equipage, equipment,
   facilities, facility, faction, field army, field train, file, firm,
   fit, fit out, fit up, fittings, fixtures, fleet, flying column,
   furnish, furnishings, furniture, gang, garb, garrison, gear, getup,
   group, grouping, groupment, habit, harness, heel, impedimenta,
   in-group, ingroup, inner circle, installations, junta, junto, kit,
   kitchen police, legion, livery, luggage, machinery, man, maniple,
   masquerade, materiel, mob, motley, movement, munition, munitions,
   organization, out-group, pack, paraphernalia, party, peer group,
   phalanx, plant, platoon, plumbing, posse, prepare, provision, rank,
   regiment, rig, rig out, rig up, rigging, ring, salon, section,
   series, set, set-up, sock, squad, squadron, stable, staff, stock,
   stock-in-trade, string, suit, suite, supply, tack, tackle,
   tactical unit, task force, team, things, tights, togs, train,
   trappings, traps, tribe, troop, troupe, trousseau, turn out,
   turnout, tutu, uniform, unit, utensils, wardrobe, we-group, wing