It's your first time, just smile and enjoy it.
As for clothing, you dont need to spend a fortune. Most of all wear something you feel comfortable in, you wont dance your best if you're worried or distracted by what you have on.
You get scored for dress or apperance, so to make you look more 'together' try wearing similar colours, or have a running theme for example ive seen the man wear black trousers and white top, and the lady wear white trousers and black top in the past.
Im not an expert on this but hope it helps anyway.
Good Luck and Have Fun
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