I panic at the thought of going casual. After fifteen years of wearing a jacket and tie to work, I hardly own any casual clothes. For weekend wear I buy clothes at a local army surplus store. Looking like I just stepped out of the jungle is fine for mowing the lawn, but showing up at work head to foot in camo makes the guys at the security desk more than a little nervous. A long sleeved shirt and a jacket hide all of that, although I get a lot fewer free sandwiches.
Casual shoes are a big problem.
I have a bunch, but sneakers hurt my feet. And the only time I slipped and fell seriously was when I was wearing running shoes. On the other hand, I walked all over the Nevada desert without incident in a pair of dress loafers. Of course, I should point out that when I had a part time job at college as a courier I wore a full tuxedo one day on a bet. Couriers rarely make anyone's best dressed list, and I was surprised later in the day by a visit from the Chairman of the Board, who I think came downstairs to figure out if he was paying his couriers too much.