As far as footwear, we do have to wear closed toe shoes. I wear steel toe leather work boots at all times anyways, so it doesn't change anything for me.
We used to be required to wear either an antistatic coat or a heel strap in the systems lab, ever since the trip I took to Colorado a few months back we've been required to wear both due to something we jokingly call "the Fetzer effect", after one of my co-workers. We discovered a hardware bug due to his polyester sports team jacket, a signal wire was not properly filtered. Only realized it when he was standing 6 feet away from a system and we had a scope on that signal, every time he moved his arms we would get a multiple volt spike... on a 1.1 volt signal. Needless to say it was confusing things greatly, the design got fixed to include filtering, and antistatic coats and ground straps are required at all times now!