DictionaryRoot: costumer
French
costumer
dress in a costume
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noun
costumier
kahs-TOO-mee-ay/kɑːsˈtuːmieɪ/
A person or business that supplies theatrical costumes.
Etymology
The verb means to dress someone in a costume, and the ending identifies a person engaged in that work. The resulting occupation covers making or supplying the clothing, rather than simply wearing it.