This may help. From the horses mouth....

Business attire is required for your first day of Orientation class and for special events including class photos. For female trainees, business attire includes dark dresses, suits or pantsuits. Business attire for men is a dark business suit, shirt and tie. Even if you are eligible for a hotel room during Orientation, lodging will be your responsibility following the initial twelve hotel days. The New Hire Coordinator's office may be able to assist you with leads on local temporary housing. FWIW