WordNet (r) 3.0 (2006):

fatigues
    n 1: military uniform worn by military personnel when doing
         menial labor

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "fatigues":
   apparel, array, attire, bedizenment, clothes, clothing, costume,
   drapery, dress, dressing, duds, fashion, feathers, fig, garb,
   garments, gear, guise, habiliment, habit, investiture, investment,
   linen, rags, raiment, robes, sportswear, style, threads, togs,
   toilette, trim, vestment, vesture, wear, wearing apparel