I'm short, round, and curvy so shopping for me is just awful. I shop almost exclusively at Fashion Bug as the price is usually right and their stuff seems to fit me pretty good all around, even in the arms which are usually too long in other stores' plus sizes. I have their credit card so they're always sending me coupons and I save lots of money. They recently closed most of the stores around me so it's getting harder and harder to find clothes. I hope they don't close up all together.
Once in a while I go to Lane Bryant or Avenue but they are much more expensive and the legs and sleeves never fit me right and I look like I'm wearing big and tall clothes only I'm not tall. I do buy all my bras at LB though.
I also hit Torrid once in a while too but also find them very expensive for what I get and the sizing is very inconsistent. I recently bought a bunch of shirts online from Torrid all in the same size. A third of them fit fine, a third were too tight, and a third were too big.
I never find anything I like at Target so I've stopped shopping there and Old Navy has discontinued their plus size line in my area so I have to shop online for plus size stuff from them. That said, last summer I bought a few polos from Old Navy online and they fit really nicely. Long enough to cover my hips but nipped in a little at the waist and really cute. Unfortunately they didn't sell them again this year.
I also buy Denim & Co on QVC once in a while as the sizing is pretty consistent.