The thighs. Oh my. Every woman, unless extraordinarily lean, will have issues with this shapewear target area. Shapewear has always addressed this, but not always well. When you compress the thigh area with a shaper, it tends to leave an indentation not unlike a "sausage roll." Newer engineered knit fabrics help make a smoother transition to skin so there's no visible line. Laser-cut hems also help, as there's no elastic to make a line. Styles vary from waist-length to high rise and high-waisted, which help prevent "muffin top," a whole different target area.
Many of the full-length shapers with shoulder straps have torsette fronts to accommodate different bras. With shapewear, you frequently get a package deal with more than one target area solution, thankfully. Girdle styles often have garters to attach sexy hosiery. HerRoom carries a wide variety of thigh shaper styles, in average and plus sizes.