Tip #1 - What to Wear to Expo and other career-related events or opportunities
Business Casual dress: you should have an outfit that includes nice shoes, a collared shirt / dress shirt, and dress pants. Tie not required.
Professional Business attire: This should include a shirt and tie, dress pants, nice shoes. Suit jacket is a nice addition. Ladies, a nice dress suit with dress pants or a skirt and a jacket would be great. Skirts should be to your knee and not skin tight tube skirts. Think a nice straight pencil skirt. Shoes / heels with a heel height appropriate for work.
If you don't have anything yet to wear and you have a strict budget, the Volunteers of America on Indianola or other thrift stores close to campus often have a great selection of very nice brand name clothing for very little money. You shoud be able to outfit yourself for $20 or less.