Isit the one coming up... along Mohd. Sultan?
Just went down recently, collegue is in the
competition too, She was there over the wkends
for "training" 
Honestly, what u shd wear..
i personally would say.. nothing tight cos u
need to dance but it has to be body-hugging
so that it shows all the curves that you have got.
Perhaps a nice pair of jeans, a stable pair
of heels and a sexy top would complete ur
attire for the night. Just remember, nothing
sleazy, sexy and revealing but not over the top.
Maybe you could rent the Coyotle Ugly DVD
for some inspiration ya.
Good luck on ur competition!