Storm The Stage

I have my audition on this saturday, and I only found out last week, and i have had exams throughout the last two weeks and my last exam is tomorrow. So I have one day to practice my piece, I'm probably gonna walk in there and suck really bad.

Also, they said to supply your own costume, but to what extent should this be? I mean i'm doing a monologue from the 1800s and i don't know if i have to go full-out and get an 1800s dress.. any recommendations??