For every couple dressed like this, there's a million who color-code and call it a day.
Even then they usually end up arguing on prom night over the precise shade of color meant by "puce."
Nothing will stop me from going to prom.
All the more power to them!
Maybe you're really, really, REALLY, into your American history in the south. That's all well and good. The implications of wearing that around at a formal event? Maybe you need to ponder that a little bit.