>>53760196On second thought you're probably right. Looking again like in Sugimori's original artwork the dress frill seem to be lifting up like spikes likely due to Jynx's psychic powers (her hair goes behind the frill). Other models just have the dress frills down on the ground and it does look like a perspective error in many cases.
They've also been tweaking Jynx's design over the years to make her look less like a black woman (purple skin, more cartoony bulbous head and hands, turning the floating/perspective error frills into spikes/tentacles to make it look less like a dress and more like part of its body without).