Information adapted from adMISSION POSSIBLE®.
You should wear something you’re comfortable in. That doesn’t mean you should show up in a pair of sweatpants and a T-shirt, but it also means that you don’t have to wear a business suit and the dress shoes that give you blisters.
You should dress in business casual attire, which means: NO jeans, sweats, T-shirts, or gym shoes.
Remember that you may be doing some walking, so wear shoes that will be comfortable for about an hour of walking.