That fabric stretch at the breast really needs to be a built-in morph feature. Maybe the morph tool might give you what you want but be prepared to spend quite a bit of time perfecting.

@ranym77: you can bring in the Genesis series models into P12 if you save them back into the Library in P11. I have done it but Genesis 8 is a pain to pose without pose presets. But it can be done. I really need to attempt it on my second computer to verify that it consistently works.