You could expand your skirt by using bonemod like I did for white Bowsette. There is some kind of universal long skirt This-stupid-anon-again used for making his Lapis from Steven Universe the name is
[Hukuma] Mod_Package at Pack_05
https://mega.nz/#F!J5oFgDDa!htTLLOzDZ4o1lPkGOe71AA!95JQXTaS