Pretty unusual request but I know there are some few women who get off on male CDing so I'll assume you are one of them. Some people consider themselves born crossdressers, others come to it from life experiences or to fill some psycho-sexual need. I know for me part of the turn on is that my dressing is pleasing and/or exciting to my wife/partner. I guess you can try doing it a little bit with him while involved in other sex play and see where it goes. If he gets a really good reaction from you when he wears a piece of lingerie for example, and that reaction from you allows him to have extra fun, he may go with it to some extent. Young guys like sex and he wants to please you so I suspect over time he will try more stuff for you. Still, he may never be into it as much as you.