Hat: Barma Suede Cooler 1064HI
Rugged and holds it's shape really well in higher winds. I picked this up in Michigan from a dealer at a festival. Tried on many till I found one that was a perfect fit and I can say this is probably the best hat I've had for outdoors with lots of sun.
Shades: Polarized, dark lens sunglasses with 100% UV protection. I usually just pick up relatively cheap frames from a sporting goods store.
Shirt: Lightweight polyester vented fishing shirt with a collar. I don't really care for having 100 pockets on the shirt, but it is far more comfortable when you are sweating in the sun and heat of the day. These don't seem to stick to you or feel moist later in the day after the temps start to drop as well. (thanks to some forum members for this. I had a thread about hot weather clothing on the ol' forum)
Sunblock: Coppertone sports spf 30 + I usually get a little bit of sun if I'm out all day but I only apply once in the morning before an all day outdoor event.
Shorts: Something light in color. I usually am fine in jean or khaki shorts. Basketball shorts are comfortable when you are running around but don't look right with a fishing shirt. . .lol
TONS of water. I can drink a gallon in a few hours if I'm really active. I usually take a breather in the shade every few hours during festivals to try and cool off.