Brilliant
btw, most wedding receptions nowadays seem to be in dingy halls above restaurants, unless I guess, if you live in CA or FL or the far east, in which case you might do it on the beach (and in which case we'd be discussing entirely different attire...
Anyway, most weddings are held in churches or temples or mosques, so be thankful you didn't have to sit and stand and sit and wait through all of that. The reception is the best bit.
So glad you ditched the modern clip on braces. I was gonna suggest that you find proper ones, slightly skinnier, not 2" wide. They should be 1" wide maximum, so that you can hook your thumbs under them if you feel like doing a swaggeringly posh pose.
You'd do well to scour vintage shops (you could probably even find brand new old ones in the original packaging if you have an aversion to 2nd hand stuff). Myself, I adore vintage, some of the parties my frocks have been to boggle my mind to imagine, I collect 1950's.
If you don't have a suit with buttons on the inside of the waistband, it's fairly easy to sew them on.
Clip on suspenders are kinda like clip-on bow ties, a no-go area? Please find proper ones for the next wedding you attend.
As for over-dressing, forget that! You're just being modest, right?
All you need is a good suit which fits well and then accessories, lots of them! Cummerbunds are rather fun? Also very funny. I was at a wedding reception once where all the blokes were dressed in matching grey tuxedos, pink shirts and purple bow ties and cummerbunds. They all got drunk and took off the waistbits and danced around wearing them as blindfolds. Might have been one of those you had to be there things, but anyways...
Just enjoy yourself - and if you look better than everyone else, thank your lucky stars (or your genes - or something). Dressing up for an occasion is fun and as long as you feel comfortable and confident, people will appreciate the way you look and the fact that you've made an effort on their big day.
xL