IncogNeato:

If she hates the idea so much, choose to dress as a Disney Princess. The hairstyles are decent, and the dresses are generally presentable. And they are cartoon characters, after all.

Personally, I'd dress up as something cool, like Wonderwoman, Tweety or Underdog. Or maybe Sweet Polly, and make Hubby dress like Underdog.

I would love to go to a wedding like this. Personally, I would get a friend of mine to help me dress up like Dot from Animaniacs.