There's some story I can't fully remember now about REmake's development where at one point Mikami caught the staff going way overboard with being weirdly horny about Jill, like they were doing a vote on what colour her panties should be and he had to reign them in. Considering Mikami himself clearly does not object to horny things in his games it must've been quite bad

Her body lines are less accentuated than in the original cause everything that wasnt body line was blurry ps1 texture.

What's this supposed to be? Is it for fixing her posture?

Male Gaze for sure. But I will say Jill's got a lot of woman fans too.