I'm going to a masquerade ball for the first time on halloween, What should I wear?

I'm going to a masquerade ball for the first time on halloween, What should I wear?
What should I wear and where can I get decent looking masquerade costumes?
And is there a special dance I have to know?
(like is it ballroom dancing?)

A tuxedo, and a phantom of the opera mask.

BYU Ballroom Dance 9 O'Clock Team; Winter 2009 Vienesse Waltz

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