>>44498764I mean, in terms of lore, we really don't know how those skirt/dress things work at all. I doubt body modding is something they'd want to go through for something so large. They might do things like wrap it up or coil it in some manner to tie it around their waist, but it won't be something that would actively remove it.
I think removing it, would not do anything to their psychic powers, as that is tied to their horns which empower those abilities. If the horns were destroyed or removed it's levitation and psychic abilities would weaken. If the skirt was removed, it would be extremely painful.