I have a wedding coming up in a week and a half and I need to buy a dress for it. I feel like I want this one....should I do it, or am I insane?!

ETA: 1) It's from ModCloth. 2) The wedding is going to be a hootenanny with bluegrass and much outdoor dancing, so we can rest assured that nobody will be offended re: this dress's ridiculousness. I'm wondering purely about aesthetics, not appropriateness. :)