The process of making, selecting, or dressing someone in costumes; the costumes and related work in a theatrical production.
From 'costume' plus the gerund suffix '-ing'. This term became standard in theater terminology in the 20th century as costume design became recognized as a specialized discipline.
Costuming is way more than just picking pretty outfits—a costume designer for a historical movie might spend weeks researching what people actually wore, including the underwear invisible to the camera, because authenticity affects how actors move and feel.
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