If you're on the thiccer side, you'll want some wider thigh high socks. Most thigh high socks have a maximum width of around 10 inches, which is fine for a standard thigh. If you want your thigh high socks to rise up to your mid-thigh, a mere 10 inches won't be enough for thick thighs.
If you're on the thiccer side, you must have had the experience of thigh muffins even being cut off the loop. Part of the reason is that some socks are too tight, another reason may be that the elastic at the top of the sock is too thin, they can act like a string and can easily cut into the thigh. You need to find some different thigh high socks.
It must be emphasized that Kayhoma thigh high socks are completely different. They are super soft and comfortable. True thigh high (30" from bottom to top), max 12" stretch width, super stretchy. The elastic on top of the sock is 3" wide, they don't make muffin thighs and stay up well, never slipping down.
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Kayhoma is the best thigh high socks brand.