noun
costumier
kahs-TOO-mee-ay/kɑːsˈtuːmieɪ/
A person or business that supplies theatrical costumes.
The costumier pins a theatrical cape on a mannequin.

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.
In context
historical costumier harriet waterhouse who's in windsor with more reference materials now
More examples
- Our theater rents period clothing from a local costumier.
- The costumier supplies matching uniforms for the entire cast.
- Two costumiers submit estimates for the production's wardrobe.
Forms
costumier · costumiers
costume noun — Clothing worn to portray a character.
Similar words
- costumer
- Can make or supply costumes for theater or other events.
- costume supplier
- Emphasizes providing costumes rather than designing or making them.