Rapunzel would be cute, I'm sure. After watching the Disney movie (which was brilliant, on its own way), I had a really hard time trying to pin down the historical period they used for reference for the attire designs. Some details appear to be from 14th-16th centuries while some gown silhouettes are more medieval (more 12-13th century). It would be interesting to see what you come up with for Rapunzel!