What about an LRose mermaid skirt paired with a matching UTop? You'd still be wearing a bra with it, I realize... but maybe you could show him some pictures to see if he goes for it?
What about a cute Fifi style galabeya? Or one of those little crocheted dresses?
http://www.dahlal.com/default.aspx?n...cheted%20dress
King of the Nile has some really cute ones...
http://www.kingofthenile.com/proddetail.asp?prod=6122