The Costumer | 236 followers on LinkedIn. Costume design, rental, & sales. Advancing the transformative benefits of theatre arts for 100 years and counting. | The Costumer offers thousands of costumes for sale or rental perfect for any occasion, including Halloween, Christmas, school plays, and much more. by The Costumer offering Theatrical, Halloween (Seasonal) and Masquerade Costumes including theatrical makeup, wigs, hats, props and other costume accessories.