Size 2 pants? Seriously? You should check out title 9. They sell well made and stylin' athletic clothes in tiny sizes. They make me mad because they don't carry plus size stuff because they tried and the stuff didn't sell. They didn't sell because the plus size items were all a dull solid color, not the colorful things they have in their regular clothes.

REI sells all kinds of athletic tights, pants, etc in a variety of sizes including plus.

Eddie Bauer is good for outerwear. They have a huge variety of sizes, from petite to women's. And, their online site gives the dimensions of the item.