From the FAQ:
What about clothes?
We'd prefer you wear comfortable clothes. Long pants and long sleeves are best and we will ask you not to wear shorts, open-toed shoes or sandals. If you want to wear your thousand dollar, flame-retardant, one-piece, Formula One racing suit to intimidate the other competitive drivers - be our guest.
It's going to be hot and humid when we race in July so I will probably be wearing shorts.
