Hey
I went to the last Brisbane open day and only decided to apply the day before and i got through. Everybody wears a business suit. I went out and spent about $500 on a suit. When I arrived, I was a little intimidated because everyone looked so perfect, and well groomed.
I would advise to wear a suit with a knee lenght pencil skirt, sink coloured stockings and black polished court shoes. Make - up and pull you hair back into a low bun or french roll, and wear minimal jewellery.
Best of Luck.