Per the email my son received (He did the Cadet For A Day last week):
We recommend you bring the following items with you:
Pillowcase and Sleeping Bag (we'll provide a pillow)
Business Casual Clothes (shirt, sweater, slacks, comfortable shoes - jeans are not preferred)
Jacket/Outerwear (it can be very cold in November and December)
Athletic Items (optional; gym clothes and a pad-lock for locker)
Other (sleeping clothes, bathrobe, shower shoes, towel/washcloth, toiletries)
Homework/Reading Materials (you may have some “down time” during study hour)
Spending Money (if you plan to visit the Cadet Bookstore, Souvenir Shop or Snack Bar)