I found a great shop at Memorial City Mall....Torrid...It is a store for plus-sized women and they start out at size 12 and they have awesome clothes and very "in style" clothes. Check out their website too www.torrid.com. I went there and got some nice stuff. But fair warning, if you buy a pair of Paris Blues Jeans they have some stretch in them and I made the mistake of getting a 16 when I should have gotten the 14's, now after one wear and wash they are too big! So get the tighter with stretch and they will loosen up just fine!
I just checked their sizes and it looks like they go up to a 26 in pants and their tops are sized from 0-4 and they have a size chart to help.
I hope this helps you!
And there is another web site called www.alight.com that carries very nice a stylish plus sizes and I think they go up to a 26-28.