Webster's English Dictionary

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costume

cos.tume \'ka:s-.t(y)u:m, ka:s-'\ n [F, fr. It, custom, dress, fr. L 
   consuetudin-, consuetudo custom] 1: the prevailing fashion in coiffure, 
   jewelry, and apparel of a period, co untry, or class 2: a suit or dress 
   characteristic of a period, country, or class  3: a person's ensemble of 
   outer garments; esp : a woman's ensemble  of dress with coat or jacket - 
   costume vt