The way I do any cloth dynamics  works this way. I load my figure, and dynamic cloth in frame 1.  Zero the figure and make sure the cloth is fitting over it. with no pokethroughs. Next, go to the last frame. I usually use Poser's defaut of thirty, but that's just me. Inject your morph, and pose the figure. Ignore any pokethrus. That's pretty much it.

 When you go into the cloth room and set up your dynamics and collisions, just be sure to select "Zero figure when draping".

Your morphed figure will start out at frame 1, and should "grow" into the clothing by the last frame.