I tried the whole day to make the skirt work and failed, so in the end, I decided to swap the skirt for a Hakama, the traditional samurai pants that looked like a skirt like the one used by Halibel.

This is the original version, in THIS pose it looks ok, but animated it is a terror...
The Hakama is not finished yet and requires a LOT of work since I needed to re-start it from zero.