>>14250
I do not know everything in details, but I just checked Unity features on youtube, and it was surprising what is already done and what is possible.
Sure there can be serious limitations that I do not know so I can't argue with you about that stuff
the cutting script is this one www.youtube.com/watch?v=xgoUmrhXyYE
I don't know if it can work on the rigged model but I don't see any reason why not.

Here is another example how to make body fall and bend
youtube.com/watch?v=uQOuqWe0uAE

Also, there is plenty of other stuff which is somewhat paid but those unity packages can be donwloaded for free too.
something like this soft body simulator which could work great on boobs
youtube.com/watch?v=3sPufMa5uyo