I am a Plus Size Girl too. I shop at the stores you mentioned but I also have great luck at department stores’s Plus Size Departments. Lord and Taylor and Macy’s have a great plus size selection. The Worthington Line at JC Penney’s is good if you need clothes for work.
As far as jeans go, I have good luck at the Avenue. The Seven for All Mankind Jeans are very flattering. I also check the sales racks at Macys and Lord and Taylor for Michael Koors Jeans. I find Micahel Koors pants are flattering for plus size girls in general.