If you go to www.davidsbridal.com, you will find several formal evening dresses for teenagers. You can look under bridal party if you want and these dresses can be used for prom as well.
Formal evening gowns may be bought in local department stores such as Macy's, Saks and Neiman Marcus. Evening gowns may also be bought in formal wear stores such as David's Bridal and Simply Dresses.
There are several online stores with a variety of beutiful dresses. For example, http://www.sydneyscloset.com/ or http://www.igigi.com/plus-size-dresses/plus-size-evening-dress or http://www.curvely.com/formaldresses.html
A lot of stores in California carry petite formal dresses. Major retailers like JC Penney and Macy's have entire petite sections.
Evening dresses can easily be purchased in stores such as Debenhams. There is an excellent selection there from various brands and they have changing rooms so they can be tried for fit and style.
Plus size evening dresses can be found in local stores like Macys, Forever 21, Belk, JC Penny, and Nordstrom. Online websites like Overstock, Lanebryant, and Dressbarn have these dresses for sale.
Finding formal dresses in larger sizes can be difficult because many manufacturers do not make larger sizes for formal gowns. You can find great prices and very pretty dresses in plus sizes online.
You can find plus size formal dresses at Macy's and Bloomingdales. These stores are located throughout the United States. You can also go online and look at there merchandise.
Formal dresses in junior sizes can be found at your local Walmart or JC Penny's. You certainly don't have to go to a specialty fashion store. Your local mall should have many stores with junior dresses.
A couple websites that sell plus size evening dresses are http://www.igigi.com/plus-size-dresses and http://www.therosedress.com/Plus_Size/index.asp. You may also find them at large department stores, such as JCPenny or Sears.
There are some stores such as Wal Mart, Target and Kmart that all sell plus sized dresses. There are also stores out there that dedicate to the plus size individual. Lane Bryant and Torrid are the two major plus size retailers out there.
Century 21 sells really inexpensive dresses for teenagers in NY. They carry huge discounts on designer brands so your teen will be able to find fancy stuff for cheap. It is located on Cortlandt St.
macys.com:) It has really good dresses.