- Bloomingdale's
- ChicStar -- Some very cute retro/vintage style dresses on there that might be good for prom or other special occasions.
- City Chic
- Collectif -- UK. Like ChicStar, they have retro/vintage style dresses.
- Crimson Empress -- Gorgeous handmade custom wedding gowns, formal gowns, and shrugs.
- Curvety -- Both formal gowns and wedding gowns.
- David's Bridal -- Both formal gowns and wedding gowns.
- Deb's -- Juniors prom gowns.
- Dillard's -- Formal wear.
- Domino Dollhouse -- A few semi-formal options.
- Forever21+ -- Prom dresses and accessories.
- Fashion to Figure
- Figuresque
- Igigi -- Prom and bridal gowns.
- JC Penney
- Jessica McClintock -- Prom and bridal gowns up to size 18.
- Loop18 -- Prom dresses.
- Macy's -- Prom dresses.
- Nordstrom -- Prom and bridal gowns.
- Pin-Up Girl Clothing -- Retro/vintage style formal dresses.
- Platipuses -- Original handmade prom dresses.
- Plus Size Fix
- Pulp Up -- France. Gothic, "darkwear," and retro/vintage style dresses.
- Roaman's -- Prom and bridal gowns.
- The Rose Dress -- Probably the biggest selection of formal, prom, and bridal gowns that I've found.
- Saks Fifth Avenue -- Prom/evening gowns.
- Sonsi
- Stop Staring! -- Retro/vintage style dresses.
- Swak Designs -- A few special occasion dresses.
- Torrid
-Shelby