My mesh seems to be broken can you guys help?

Always share files while asking for help, it's easier to help directly this way. Now we can only guess
I think you mean this swimsuit is cc you've made, you joined it with body and then done uv_1 etc? You should do it without body parts, only for your bikini mesh and after everything is ready (uv_1, weights, vertex paint) join with body parts. Body is perfectly made by ea, you do not need to transfer anything to it - only if you really need to do this Delete body and append new one if what I wrote before is the problem