Hi there, I won't pretend to be an expert , I am at the moment putting together my first kit , but I have looked at picture after picture for the past year for reference and every f/x leg I can recall is squared off a bit at the bottom , you could try heating and reshaping but caution when doing this , could easily end up looking a mess or if you want to spend ££££ ££££'s sds will supply thighs also rt will do thighs seperate, the only thing there is the strip running down the front which I believe both of these have , unlike the f/x where it wraps round so you might need to add a strip to the fronts of the calfs as well.
I expect others do thighs seperate but these two are ones I know of for definate.
Cheers................