So many poses in Poser cause the underlying figure to intersect itself. As soon as it does that, no symulation is going to work right in that area. Something as simple as having a character put its arms down to its sides will blow up the sym in the as soon as the upper arms intersect the figure's sides.

This is why the most common form of Dynamic clothing is the sleeveless dress.

I'd rather stay in my lane than lay in my stain!