If you are a person likes to be with multicultural environment, Bradley University offers Student Apartments all around the campus. A heavy jacket with a hood, gloves, woolen socks, ear-muffs and monkey caps are also very useful. However, it is a better idea to buy your winter jackets here. Peoria is subject to frequent changes in weather and expect rain at any time, so don't forget to get an umbrella or a raincoat. A pair of good water-proof boots like the Woodland brand would also be very useful.
Summer is warm, almost hot and very humid.
It's the time to wear T-shirts, shorts, etc. Cottons are quite expensive here unless you find a good deal or blow out sale. So, you might want to get some from home. Try and bring some formal attire too. A blazer or a suit, ties, a formal wear shirt, a skirt suit etc.