You can use a magnet to pull the fabric between the breasts out.

Dynamic clothing will fall more realistically, and won't have that "boob sock" look. You can adjust the settings in the cloth room as well, so the garment is less or more clingy.

No DAZ figures after V4 work in Poser 12. DSON is a Python script, and will not run in Poser 12. (They had to go to a new version of Python because the old version reached its end of life.)