It depends on the 'theme' of the wedding, but I would say it is a bit too simple. It was something about the shoulder straps that made it look a bit cheap (sorry). I don't think it is too short though- you have beautiful legs, so why not show them off haha!
i guess it is a little bit too simple, but it's not too bad. i think you could make it work if you added a nice statement necklace, and a belt, and some accessories :-) i mean you don't really wanna be TOO dressed up either..