Recollections is a web-based store featuring ready-made costumes from the Regency to the Roaring 20s, in a variety of style for day and evening and in a wide array of fabrics. One of the theaters I work for used pieces from them for a show and we were well pleased. It arrived looking just like the photo, was sturdily-made, and the price was good for our never-quite-enough budget. Best of all, it integrated well with the intricate and well-researched costumes that we had made and borrowed from some of the best costume sources on the east coast.
I love their hats and accessories, and you can expect to find virtually anything from underpinnings to pocketwatches, mourning clothing to parasols. I should mention that their menswear section is a lot smaller, but still well-made and priced. When I am next putting together a costume, especially a Victorian one, I will be revisiting their site.