The fact of the matter is that body fat has to go somewhere. If you wear a lower body support garment. the fat comes out at the waist. If you were an upper body garment, the fat comes out  under your armpits. If you wear a total torso garment, the fat comes out on your back and on your thighs.

You can only displace rolls of fat, but you can never destroy them.

However, if you are looking for undergarments for a mature body, I suggest Nordstrom online.