I think the problem is not their thighs but their pelvis. The crotch is too high and the hips too narrow, causing their thighs to stick out in a very odd manner. Had you made a larger pelvis, their thighs would flow much more naturally. Also, it seems debbie's neck is misaligned mith the base of her head and the ear is too close to her eye. For the sweater, the fold between their necks seems weird and purposeless and there really shouldn't be cleavage when wearing sweaters. And the shoulders seem a bit overkill, they curve way too much to appear natural. Yes, sweaters should look wavy when you wear them , but not that much.
But in overall, I'm impressed, this seems quite better anatomically than your average artwork as the errors are mostly on details