One thing I have noticed in working with dynamics... If you are making a true dynamic set, such as a loose gown/night gown such as in Daveso's render. etc.  triangles seem to drape better. This goes against the conforming clothing where quads seem to be the rule. I THINK it may have something to do with the collision or may just allow the cloth to fold easier, not really sure.

Nanette, you can access the lower frame if you are working for a still render by moving the frame slider back to frame 58. Also, if working on a still, after the cloth sim completes you will find a "dynamics" dial in the properties of the dress etc., after going back to the Pose Room, where the cloth draping can be dialed as a morph, letting you "back" up slightly. Try those to tricks and see if that helps, obviously if you are working on an animation it won;t help much, unless you can delete that last few frames, and then have the animation just stop at frame 58...

I don;t really understand WHY the cloth collapses thru the knees unless you have some part of the skirt poking thru the figures skin at the start of the simulation. If you have ANY poke thru when running the sim, even in an unrelated area such as the hip or waist, this seems to confuse poser and allow it to ignore collision detection in other areas.