Aha, I am going to Wisconsin this weekend too. I am interviewing though. Since you said you are on a visit instead of interview. I would assume that you are already admitted. If that is the case, dress as much as you can to feel warm and comfortable. Wisconsin winters can be brutal for someone from California. If you are not yet admitted, I would go with business casual. Wool suits with wool top coats and all the gloves, cashmere scarf, and hat for male. For female? I do not know