mesh looking a little weird on plus size and pregnant sims-S

So I made a clothing mesh recently and everything works fine except for the way it looks on plus size or pregnant sims. it fits their bodies and they can walk smoothly with the mesh except for one problem. When they turn to the side, there are weird structures on the stomach region. I have included a picture down below.

While doing weight transfer I assigned it to the right breast, I also did subdivision surface multiple times so it comes out smooth. But this problem still persists. I was wondering if anyone knows how to fix this problem? Because this is the only issue with the mesh :( 

Here is the link to the picture: 


imgur.com/O3Wu1jZ