Quote:
Originally Posted by
HopefulNihilist 
I've always found the blue SC gray trousers combo a bit... well, boring. And you might be mistaken for an airline employee. Not exactly groundbreaking, but I'd go with tan trousers. I'd also consider throwing a pocket square into the mix to liven things up a bit. Nothing too avant-garde, as it's easy to go overboard, and I think it'd really clash with the more traditional look of the navy SC/tan pants look. Fit is also crucial. I don't know how much you're willing to spend, as this seems to just be a one-night affair, but taking the outfit to the tailors wouldn't hurt at all. Good luck.
Oh, and welcome.
Give me a break, it's a kid going to a school dance.
OP, don't wear a pocket square, and I wouldn't do the bow tie. If you have anther tie option, consider a Navy pindot, houndsooth or other conservative pattern. Just wear what you described, try to do your best to make sure everything fits (not oversized - it makes you look sloppy) and you will be fine. Give your shoes a shine.
Pick the hottest girl that's not dancing and go ask her. You would be amazed at how many hot girls don't get asked to dance.