wardrobe mistress 
(or wardrobe master)
noun
A woman (or man) in charge of the making and organization of the costumes in a theatrical company.The wardrobe mistress came from Kubrick's stable, and the make-up is flawless (and won the movie an Oscar nomination)....
- A Leigh-born wardrobe mistress and costumier to the stars, Jean Hunnisett, has died aged 73.
- If I hadn't become a successful actor I'd have been a wardrobe mistress, without a doubt.