I followed your suggestion and downloaded a few items. But no luck.

Anything like a skirt has severe problems.

With the kids morph, the skirt starts to distort where the hip and the thigh bodypart meet, they each rotate independently.

For all genesis meshes moving the skirt with one leg stretches the clothing mesh in an unacceptable way - it looks like the weightmaps are limited to a single bodypart here

It looks like the conversion of a skirt needs some updating in the exporter