Second Time Around Advise On Wedding Dress

Hi - This will be both of our 2nd time around. We are having a small wedding on our deck in the backyard. Just imediate family and a few friends. What type of dress is appropriate for this? I was thinking of a three quarter length dress, I would still like to wear something that looks like a bride but don`t want to look too formal and a lot of the dresses are for much younger people. (I`m 46) Any suggestions?
Thanks