Personal toy? I am about to assume...
So if she has no problems with you making a replica of her boobs for erotic pleasure, I somehow doubt she would have a problem with you wanting to wear them.
It just does not make sense - "You can use them for nasty things but you can't wear them..."
Just let her know first why you really want them. Of course by "personal toy", that could mean anything...
Well, happy boobing (. )( .)
Erin