I have the exact problem. Most of my jeans make me look like I have a saggy butt and flappy thighs, however I actually have found a style that I loooove.

Levi's Women's/Misses 522 cut- tapered fit, tapered leg. They actually are cut smaller in the rump and legs. I had a hard time finding them, but I was sooo glad once I did.

Another thing that helps is that I've dropped from a sz. 28 to a sz. 22 and now the legs and bootie cuts on pants are finally getting smaller- so you have size shrinkage to look forward to!

Best of luck in the hunt for the perfect jeans!

Nikki