Deb has a plus sized formal section. Check them out at depshops.com or see if there is a store in your area. They have a pretty good selection at very reasonable prices.
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.
Plus size dresses are available online from most of the major retailers. There are a great selection of new and gently used plus size dresses on ebay that can save you a fortune when shopping.
Depending on how much you are willing to spend on the dress there are many websites that offer plus size dresses. Some of these are lanebryant.com, macy's.com, avenue.com and amazon.com.
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One place to purchase plus size dresses for cheap is alight.com. There are many styles of dress offered at this site, all priced so you won't break your budget.
Along with the many dresses and skirts you can buy at Macy's, you can also purchase plus size cocktail dresses there. I looked online at their site, and the prices seem reasonable by their standards.
I usually choose Yandy to buy plus size clubwear , or you can try Chinese clubwear website: girlvow.com
There are some great online stores that carry plus size cocktail dresses. Try Kiyonna, which is available at http://www.kiyonna.com/plus-size-clothing/Cocktail.html. You can also try browsing Avenue's online collection, which is available here: http://www.avenue.com/womens/clothing/plus-size-cocktail-dress.
There are a number of options for one looking to purchase plus size dresses. For example, websites such as Macy's, Forever21, New Look and DressBarn all sell them.
Maisota, Lands End, Zulily, Nordstrom, Zappo's, Amazon and Women Plus Dresses all carry black dresses in size 18. For a really good selection in size 18 always look for stores that carry plus sizes.
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.
Nordstrom, with many locations including California, is a great place to find dresses for any occassion. They have dresses ranging from eving wear, to weddings, to cocktail attire. And, sizes range from junior to plus size depending on the style.