1. One who arranges the costumes; one who deals in costumes.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• castumer,
• coustmer,
• costums,
• coustimer,
• costomor,
• cosume,
• cosutomer,
• coustumes,
• costomers,
• custmer,
• costmer,
• costumor,
• costimers,
• custumer,
• costum,
• codstume,
• costome,
• coustume,
• costemers,
• custume

• costumier,
• costumed,
• costmary,
• costume,
• customer,
• costner.

The adjective form of the word "costumer" is "costumery".

The plural of the "costumer" can be the "costumers".

The singular of the "costumer" can be the "costumer".