That reminds me, Blair Dame is one of the first times someone tried to do buttocks properly in 3D.

A still image doesn't do it justice and it looks kind of weird nowadays, but Blair's model was rigged differently from the others. Usually models back then were rigged at the shoulders, and waist, but Blair's torso was actually rendered as a single piece, and the legs were connected at the crotch, not at the waist. An explanation also doesn't do it justice, so just try to watch it in motion.

So, all that means is that Blair has butt flaps.