Just catchin up and saw your post about BM dresses. I think the ones you picked are super cute. I get what you mean about too casual, I was struggling with this as well - didn't want them in the standard dressy satin stuff, but wanted a beach feel...here's what I picked for my girls - I thought they were dressy but beachy...[img]
http://i183.photobucket.com/albums/x66/liquormixer6/alfredangelo2.jpg[/img]Also maybe you could dress what they have up with a satin sash and a starfish brooch or something.