Sorry, came to mind two others things you can try aside morphs like the one from Zeddicus they already showed to you, one of which is fully free, though only for specific parts - go to renderosity, free stuff, aemi1970 has made some "X-" things that you use as a wearable, but allow to have self collision of the character with herself, or mutual collissions between themselves. She also made a doc explaining how you can create more yourself.Tried some new things in DAZ. Currently I'm experimenting with Smoothing Modifiers. I'm not quite satisfied with the outcome. Are there any other ways to achieve better results than this?
You may want to check also morph master. It is a quite a relatively laborious process, but it does allow you to create custom morphs specifically meant to keep the volume (basically, boobs squeezing