DUH, must have misread your post. I need better glasses.
As mentioned in the other post, dress so you feel Professional. Look Professional, feel Professional, helps the state of mind to be Professional.
I wore black shoes (polished), business shirt and trousers plus a tie. The examiner turned up jeans, runners and open necked casual shirt. Felt like a complete overdressed **** for a few seconds then remembered why I was there; to get a Commercial Pilot's Licence.
I won't wish you good luck since that should not be a factor. Instead I wish you Good Skill and let us know how it was.