Roberta does this professionally, as you can see, so I gave her Vanessa and described her gown (as her usual clients are vintage Barbie and friends). My description was "Marie Antoinette-ish with a modern flair, or whatever you feel like doing."
Oh my goodness. I could not be more pleased! Vanessa is absolutely fantastic! I just love her. You can see a few more photos of her on Flickr, and some before photos here.