There are rules - despite what some who choose to suspend or ignore rules say, and jeans aren't in the "rules".., they aren't for any non casual occasion, we aren't allowed them at work either. Your dress choice is so much more appropriate. To demonstrate there are rules; My DH once wore a short sleeved shirt to a wedding in the height of Summer and when the Gentlemen were informed they could remove their jackets and ties at the reception due to the heat, his friend the groom, let it be known via another friend that his lack of effort hadn't been appreciated. You can debate all you like if he was a Groomzilla or not, but point remains it was his wedding and he had standards DH hadn't met, which made DH feel very uncomfortable - needless to say he doesn't wear an informal shirt at a wedding anymore. For ladies I do break the wedding "rules" - I'm not a hat person, can't stand them, so have often been the only lady in photos without one. I can live with that as once at the reception when the brides mother removes her hat ladies are permitted to take theirs off anyway (another rule) so from then on no one would notice.