This is a mashup i'm making for personal use: For reference this is the original mesh: My problem: I'm very new to the whole physics thing. The bikini mesh by itself DOES have breast physics, so I thought it work as is just by importing it. Obviously it does not. I have tried copying bone weights from the original bikini mesh WITH physics, but that doesn't work either. I've been struggling with this trying to figure out what I could be doing wrong. Can anyone help me out?