@jr69 I have. They don't transfer very well. At least the boots didn't.
From G8 to G9 worked great! High heel shoes, and boots transfer no problem. I used full body for the second option. It transfers the rigging better.
Full body won't work well with long skirts though. You need to find another skirt that is the same length (Approx, or full. You can delete the bones that don't matter after.) that would be a G9 outfit and then transfer the rigging over.
DD