Are you shopping in Juniors or Misses departments? Because I think Juniors clothes are made more for boyish figures; I have less problems with Juniors jeans being baggy in the hips. Maybe the designers think the young girls wearing the jeans don't have curvy hips yet! Or maybe it's because so many of the pants fit so darn low, they just sit on your hips and it doesn't matter much what your waist size is!
However, the Misses department is where I have a lot of problems with jeans being baggy in the hips and butt. Even the pants that are slightly low-cut (I never wear anything super low-cut), even in the small sizes (2-4), I usually have problems with the hips being baggy. I never realized how uncurvy I was until I started (trying to) shop in Misses!

I still have a hard time believing that the average size 2 woman has hips so much bigger than mine but maybe it's true...
And don't worry a bit about the brand, my favorite jeans ever are SO brand, an expensive brand that I find at Kohl's -- they're Juniors sizes, but they are actually a mid-rise and they even my make my little butt look curvy! lol