Someone mentioned recently that some of my stuff didn't work very well with large breasts, so I thought I'd offer a bit of advice that might help:
You can increase the distance scale, hit reset simulation and then decrease the distance scale. And also increase the collision power a bit to fit the breasts (see attached video).
The other option is to turn off soft physics on the breasts and increase the collision power a bit too (see other attached video), that seems to work fine on most of my clothes.
Hope this helps, its not ideal but its the only ways I can find to make it work.
Of course, the open chest/peekaboo clothing is all fine :)