DD is wearing an Elsa dress for BBB too. She has been begging for one of those yarn hair braid things that people on etsy make. The girl who made her Elsa dress also makes those so I'm getting her that and she wants to out it on with the princess hairstyle. Now, do I think it will look super great? Probably not lol. But she will feel special in it and I can't wait to see her smile when she gets to wear it!!!
As a side note, my DD loves wigs and the long hair. Our trip in 2012, she wore a Belle dress and found a Belle wig that she bought in Fantasy Land. She looked hilarious BUT she thought it was gorgeous!!! She walked through MK flipping it side to side and feeling so special!! Haha! So I realize that braid thing isn't an option for all DDs but if anyone's DD is like mine, you may try that.