Plus size evening dresses can definitely be tailored. It's always easier to make a dress smaller than bigger. Try finding a great seamstress in your local area.
Plus sized evening dresses are available in all manner of sizes. However, for very large women (over size 20), they may need to be custom tailored for the appropriate fit.
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.
It can definitely be hard to find elegant, high-quality evening dresses that will fit a curvy figure. However, you don't have to wear plain black to an event. For beautiful plus size clothing, try the plus size section at Nordstrom or Saks Fifth Avenue.
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.
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
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.
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Unfortunately "off the rack" stores generally don't carry plus size dresses like this, although if you look for a plus size store that specializes in larger clothing you can find something better tailored to your shape/figure.
The best place to buy a plus size evening dress for under $100 online is to shop at a store that specializes in plus size gowns. The highest rated store online is One Stop Plus (http://www.onestopplus.com) which has many evening dresses for under $100.
Body type should not dictate how one dresses. To chastise someone of size for wearing a dress is vile and chauvinistic.
The two most popular colors in general for evening dresses are black and dark blue. However, when choosing a dress it is best to select the color that flatters you most personally.
If you mean an online retailer,I would try J.Crew.They have lots of evening dresses and have plus-size choices.The sale section is a good place to get a start,then look in the new section if you don't find what you want.