Hips and thighs. Mostly thighs. I'm at a healthy weight for my height, but I just have different proportions to most women, or at least, different to the women they mostly make jeans for
I have a pair of regular bootcut jeans and a pair of wide leg jeans. The wide leg ones fit me at the hips and bum (tightly) and are skin tight
on the legs. The other jeans I got skin tight on the legs, and so I have to wear a belt with them or they will slide down my hips too far. Frustrating.
Also I can't wear boots that come up higher than my ankle, but I think that's just a big calf muscle rather than too much fat.