Crocs and Lungi
Are the way to keep cool. I don't wear a uniform any longer, so I can choose my getup for work, and Crocs are my footwear of choice. My feet squeak in them, so it means that I can't sneak anywhere unnoticed (like leave early . . .), but I don't have sweaty feet.
The Jiblitz was a present from a work colleague who had never met a mature man with Crocs at work before :-)
The lungi (I have about 10) is a legacy from my childhood in India.