The problem here is that Aiko (and the other DAZ mil3 figures) have joint controlled morphs, which the parenting won't allow for. In other words, when you move Aiko's arm, her nipple moves too. To fix this you could add a morph to the rings to put them back in the right place, but I'm not clear at the moment how you'd link it in to the parent figure's JCM. I'm sure there's a way. ;)