Remove doubles doesn't work on sims body

Hi. I can’t check the file to tell you the exact solution but here what you can do:
- in edit mode select the whole mesh with A, Select - Select boundary loops. If the edges in those areas are being highlighted, the doubles were not removed. If no, then they were removed.
If they were not removed:
- in uv editor enable sync, select all uvs of the body, remove the doubles with merge distance set to 0,0001. You may have not selected the mesh the first time. Try re-importing in s4s;
- if you re-import and nothing changes, in 3d view select half of the mesh and delete it. Save the file, re-import. The point is to see if the blend is being imported. If the preview does not update, undo the action of deleting, save, check if the version of blender you’re doing it has s4studio cas tools (and the mesh has the correct cut). If the updated blend shows up, it’s the texture

If they were removed:
- clone any maxis item with open shoulders and zoom into the shoulder area. I don’t remember if they have this issue, but if they do, this is just a texture. Check the mesh in CAS to make sure there is no problem. You are correct about s4s splitting the mesh upon import but those edges are not shaded as sharp

That is just a difference in the skin texture, not sharp edges then.
You can check it in-game and everything should be ok
you can also replace the default skin texture in s4s with the custom one