I highly recommend Chrissy Wai Ching, her studio is in Pioneer Square. I was sooo happy with the dress and the experience, and 2 more girlfriends have gone to her for their dresses as well. Her website is http://www.wai-ching.com/. You can get a great idea of her design esthetic, and since the dress is custom for you, and all hand dyed, you do get to make things more personal and to your taste.
Good luck!