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Problem with these projects is that the nude(or pants) part is diffrent bone assigned then a skirt.
So that skirt and dresses animate more smooth.
When starting these upskirt meshes i used the boneweights from the nude bottom and copied them over to the skirt.
This will work but will make the skirt animation very rough.
You better copy the ones from the skirt over to the bottom.
With sims 2 i had to do this by hand but now we have Toolkit you can use a reference mesh and copy them over with one click.
If skin is still poking through then move arround some vertice so that verts from bottom and skirt line up a little better.
Make sure to check fat in combination with fit state aswell, skin will always poke through on these sims