I'm 5'8, 150 lbs, size 6-8 in dresses, my legs are perfectly average sized, and there's no way these are thigh highs. If pulled up any further than my lower calves they'd cut off my circulation. Plus they're so tight that your skin bulges out over the top. Not sexy... It's like they're made for children. I can't imagine anyone with average sized thighs could fit into these.
Aside from that, quality seems nice, like most other Leg Ave. products. Too bad about the sizing of these.