Oh missy, there is nothing to worry about... I'm sure ANYTHING will look good. Don't stress it.
Just enjoy yourself!!!!!!!!!! That is all there is to worry about! Have fun!! It is not about how you look in a dress, but your confidence and personality once you're in it! Trust me, i would not have listened to this advice in the past, but once YOU feel good in a dress, everyone else will think you look GOOOOOD!!
