I'd go for "costume maker".
A tailor makes a very specific kind of clothing. If you wanted a Doctor Who 10th Doctor suit, and had a ton of money to spend, you'd go to a tailor.
It also depends on your budget. You can expect to pay several hundred dollars for a typical custom made costume.
Disclaimer : This post written by a Grumpy Old Man
Actually in the pipes:
- Remaking Ser Loras doublet.
- Luke Skywalker, A New Hope
- Wind Waker starter costume in swim material
Eventually: Paul from Dune, Faramir, Harry Sullivan