A person who makes, sells, or rents out costumes, especially theatrical or fancy dress costumes.
From 'costume' (a style of dress) plus the agent suffix '-er' (one who does). This theatrical term emerged in the 18th century as theater became more elaborate and professional costume-making developed as a specialized trade.
A costumer is different from a tailor—they're artists and historians who understand not just how to sew, but how clothes from different eras, countries, and characters should look and move. Major theaters have costumers on staff like doctors have nurses.
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