This is why I like phone calls. Terribly 20th century I know, but back in the age of steam locomotives and T. Rex, one would simply call up (as opposed to text, email, Facebook, Twitter etc. et al) one's friend/relative/work buddy and say- "Hey Harrison* , what exactly should I be wearing to your wedding? A tux? Bermuda shorts? Something in between?"
I tend to agree with Doc that most places you go these day, people don't really care what they wear.
People wear the same shorts and t shirts at the beach or in church, on vacation or in town. ( I can only imagine the Doc in the philharmonic as the epitome of sartorial splendor. ) So for me, personally , I have always felt a man looks his best in a three piece suit.
Well no matter Yoda, you're got a suit - and even if you worry that you're not wearing the exact 'perfect ' ensemble, no one will really care- the attention will be on the happy couple. If you already have a dark suit, you may want to bring it along as a back up . I do think, however, that you and your wife both wearing blue sounds like you' ll be a striking looking couple.
Don't fuss and worry too much either- have a good time - you can always fill out those armholes as you go along with some extra wedding cake
*Oh and I only mentioned Harrison Ford because, after all - this is mofo.