I have been searching for a comfortable pair of Over the Knee Boots for a while and I finally found some!
I like this pair in particular because they fit my calves and thighs, they barely move (no tugging them up all night, even after dancing!) and they are comfortable. I chose the style with a lower heel but they have many options.
Size I bought: I bought a 6 and they fit great. I usually wear a 6 W (wide width). Romper is a size Large.
The first time I ordered them I bought a 7 (because 6W wasn’t available) but they kept falling down and my feet slid around a lot. The size 6 fit perfectly! I would say get your normal size, don’t size up!
Boots Link: HERE
Romper Link: HERE
Romper Link (Vneck version): HERE