Buy authentic Victorian dress at websites like GentlemansEmporium.com and CKHall.com. Despite the name of the site, GentlemansEmporium.com features a variety of ready made dresses focusing mostly on Victorian day wear. They also offer authentic 19th century men's fashion, accessories and furnishing.
Christine Hall specializes in Victorian bustle gowns, Edwardian style, and movie recreations, all found at CKHall.com. This website features custom designs instead of ready made clothing. She also designs and creates undergarments and accessories.
Another option for authentic Victorian dress is to purchase a pattern designed in the Victorian era and have it made locally by a seamstress. These authentic patterns are found at TrulyVictorian.com.