well I will reserrect this and tell you what I found with working with Bishonen.

Trying to stretch and conform existing clothing doesn't really work that well because of the joint setup. I made a pair of pants for Bishonen a little while back. These were modeled around the stretched figure and then made to conform inside poser. To make this work, I had to move the joint centers and basically move all the joints around until it worked. This is no easy task mind you but if you have the patience it can work.

I havent tried parenting and applying the same pose yet, but I would be interested to see the results from a set of poses.