Well, if the waist band was set up as a constrained group in the cloth room, it wouldn't move when you calculated the dynamics, so gravity wouldn't effect it. PhilC did something similar on his Haltertop tutorial PhilC's Tutorial Site.

And by using the constrained group on the waist, you could have everything else effected by gravity, which would give you a really cool look. Especially if you had him flying through the air. I'd recommend setting up a couple of key frames with motion (at least moving along the XTran) or use the Wind Generator.

Oh, and also, if you set the waist (in case you didn't want to do the constrained group) to collide with the Abdoman and Hips it wouldn't go anywhere either. You'd just have to make sure it didn't colide with M2.

Hopefully this makes some sense... I don't think I've had enough coffee this morning:)

~ brent ~