Custom vs. Costume

Definition of Custom – noun

1. a usage or practice common to many or to a particular place or class or habitual with an individual
2. long-established practice considered as unwritten law

Definition of Custom – adjective

1. made or performed according to personal order
2. specializing in custom work or operation

Definition of Costume – noun

1. the prevailing fashion in coiffure, jewelry, and apparel of a period, country, or class
2. an outfit worn to create the appearance characteristic of a particular period, person, place, or thing envelopes