I wore a tux to the Ceroc NI 2nd anniversary ball but I had to lose the bow-tie and jacket after about an hour, I was overheating drastically! I didn't dance any better in the suit - normally I wear a loose shirt and plain dark trousers because they're not restrictive, whereas a dress shirt and jacket doesn't let you move as freely. Have worn a T-shirt to class too but it doesn't really make a difference. It's probably a combination of mental (feeling good about the way you look = more confidence) and physical (the right clothes, energy levels etc) freedom leading to better dancing rather than just one thing.
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