User blog comment:Zathronas/Analysis by an author: Beacon Ozpin/@comment-24218038-20131210201838/@comment-24218038-20131211033558

I would have agreed with you if we didn't see her using her ring to activate the dress. She passes the ring the length of her arm and we see it activating  just after the ring passes. I'm pretty sure crystal and dust are involved but that is not confirmed by what we see.