Ballroom dancing exam?

Hi
i am doing my first ballroom dancing exam and i don't no what to wear. We've been told to go over the top. We have are normal dance clothes, leotard and skirt, which we can wear but often people don't. Should it be long or short? my friend said she would lend me her dress which would be quite short and is a poof ball underneath, would this be ok?
 
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