One of the things to do in a new sim is to turn down the gravity value.  -10 meters per second puts in way too much energy into the cloth.  A better value is around -3 for cloth.  For items banging into each other rigid dynamics -10 is a good value.  The smaller the value of Gravity the less the cloth will compress.  Of course this is all going to depend on what you are trying to do.  Still shots and animations are going to have different requirements.

RedPhantom did you turn down the liner stiffness on the Right Blue dress?  Having a high gravity and low stiffness will result in the polys stretching.  

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13, 14