Whenever I try to add a morph to an item of dynamic clothing, I find that I get better results if I simply remove some collision objects or add one (possibly animated). In this case, I removed the collisions with the chest and collars - and of course "deactived" the tape that keeps the straps from sliding off her nipples.

Also, observe my attempt at a procedural leather material.

-- I'm not mad at you, just Westphalian.