I always felt more comfortable being a little underdressed than a little overdressed. Overdressing is like saying “I love you” on a second date. It turns something otherwise wonderful into the perfect tool for scarying everyone away. People will watch as you hit ground ridiculous in an ill-conceived chase for attention/affection. Being underdressed on the other hand says “I actually had something else in my plans for tonight, but I was too flattered at how much you all wanted to see me, as not to drop by”.