Oh, goody, my kind of thread! Not the red suit!!!!!! I think a dress in a blue (pastel, chambray, navy, royal) with a jacket would be super. That way, if it is hot, the jacket comes off and if it is cool, the jacket stays on. You look professional and neat either way. Other colors would be a dark beige or perhaps light brown or gray would be nice. You could pick a rose if that is in your color chart or perhaps a nice peach or even a forest green. What color is the wedding party wearing? I would suggest that you stay sort of neutral so you don't clash. I love doing weddings so have a good time and relax. After all, everyone is there to see the bride and groom.