They require you to dress business casual, so I would dress that way to an interview. Nothing with logos, no jeans, etc.
Full business suit.
Professional attire. No jeans.
Business casual - dress pants, a shirt with a collar, dress shoes.
Absolutely no jeans, hoodies, "yoga pants", hats, sneakers, t-shirts, shorts or capris, no skirts more than 2 inches above the knee, no bulky sweaters, tank tops or spaghetti straps.
You will be expected to dress like this every day there, no exceptions or you will be sent home.