Lane Bryant they has a great selection, and specialize in plus size clothing. They are also reasonably priced. You could also look at Fashion Bug and Catherine's plus size depending on your personal style you should find something at one of those places.
Anyone can find a woman's dress size 20 at any local store that sells clothing specifically for women. The average size for a women is in the 20 range so it is more than likely there will always be size 20 available at any local mall.
A size 20 dress is about 5'8"
A women's dress size is between 16 to 20
40 inches
One can buy a used Monsoon dress size 16 when one goes to websites like eBay, amazon, pronto, etc. Price is between $20 to $30 depending on style and condition.
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Since you want a green dress for a one time use, you naturally do not want to pay a lot for it. One website with green dresses that start at $20 or less is http://www.nextag.com/green-dress/shop-html. You can probably find just the thing for that Green Lantern party!
go on ebay and type Ann Curry dress
For a size 20 W dress, you typically need about 3 to 4 yards of fabric, depending on the dress style and design features. If the dress has a lot of details like ruffles or a full skirt, you may require more fabric. It's always a good idea to consult the specific pattern instructions for accurate yardage requirements.
You need to be more specific.. Where is the dress from? Is it a US size 26 or an Australian 26 etc Im Australian, so with the research that I just did on the internet a dress size 26 is on average a waist size of about 45" (inches) Which is considered to be a plus size, if you're not talking plus sizes please let us know. The inch size for a dress size 26 varied from site to site but on average it was between a 44" to a 47" I guess it depends on the dress itself. Hope I was of some help =)
Its impossible to say, because weight varies according to height. A 5' 7" size 8-10 woman will weigh significantly more than a 5'0" one. A better question might be "what is the average body fat percentage of a dress size 8-10" The answer to that would probably be around 18-20%.
Australian dress size 20 is changed to UK dress size is still size 20, but 18 of US/CA standard. When you purchase products like clothing, shoes, you have to check the size carefully. Usually, there may be two kind of size chart, one is called size conversion chart, like you asked. The other is size chart of products, which shoes how large the bust, waist and hips of the products of a particular size. Try to use products size chart but not size conversion chart.