Lip Service on 130 S Anderson Street in Los Angeles is a very popular plus-size clothing store. Also check out Fashion Line and Bizzy B, as they also carry plus-size gowns and other clothing.
Plus size formal gowns usually range in size from size 14 to 26 or higher. David's Bridal carries a large selection of plus sizes in formal gowns.
As with any article of clothing plus size formal gowns vary from brand to brand.
You can find formal gowns in plus sizes at Torrid. They offer very fashionable clothing.
There are many designers which offer plus size formal gowns, that can be viewed online. Using a search engine, simply type in the words "plus size formal gowns" There are plus size designer gowns available to view online at plussize.lovetoknow.com/Designer_Plus_Size_Evening_Wear. They even have links to designers sites for plus size also.
If you go to some of the local wedding dress shops, such as David's Bridal, you can find plus size formal gowns. You can also try the plus size section of Nordstrom or, for a more budget-friendly option, J.C. Penney.
There are several companies that offer plus size formal gowns. Some that I have seen include nordstrom.com and Roamans.com. Offline there are places like DEBS, which is a store that specializes in clothes for teens in both Jr. and Plus size.
Yes, David's Bridal sells plus size formal gowns. According to their website, they offer sizes from 16W to 24W. Sadly though, the prices are very very high.
You can purchase plus sized formal gowns at many bridal stores like David's Bridal or Bridesmart, which are located in Houston. If you are looking for a used gown, try ebay.com or craigslist.com.
Deb Shops are the best place to find Plus Size Formal Gowns. They have 2 locations near Milwaukee in Racine and Greendale. They also have a website where you can view or purchase their merchandise.
Sydney's Closet (http://sydneyscloset.com) and The Rose Dress (http://www.therosedress.com) sells plus-sized formal dresses.
Torrid has a great selection of dresses for plus size women. They are very fashionable.
You can check at the mall or local stores like Sears and Macys. There are also several women clothing stores that sell plus sized formal gowns.