There are several nice stores that cater to the 'upper class'. That is where you can find a nicer fashion. It is a little more pricey, but with discriminating taste and big clearances, a nice wardrobe can be acquired.
http://lanebryant.charmingshoppes.com/homelb.asp
We have a lot of these stores around us (I think Dallas is one of the fattest cities in the nation). Catherine's is another - they sell the same clothes as Dillards, just in human sizes.