Help: MD mesh not fitting over Sims 4 nude mesh

Hi. Did you subdivide the avatar before simulation?
If yes, you need to change skin offset and re-simulate.
If no, your MD avatar differs from the default ts4 body. You can create your own


- clone a lingerie set or something similar, export the blend, open;
- expand the rig, make the everything selectable ( cursor icon);

- in 3d view shift-select the head, the body and feet;
- File - Export - Wavefront, enable Selection only;

- open the scene in MD, RMB-click on the avatar and delete it;
- File - Add - Avatar, import it, set transforms to 0