I have found the answer to my hot weather riding protection.
I normally wear the First Gear Mesh Tex jacket. However, with over 95 degree temps, the jacket is too hot. I find myself riding with just a long sleeve cotton t-shirt in these conditions.
I just happen to notice that First Gear now offers a Mesh Tex pull over. I purchased one and love it. Even though it is black in color, it's about 30% cooler than my jacket. The pull over has a loose fitting bottom, and nothing in the chest to block the air flow.
It may not be quite as safe as the regular jacket, but it's very close. At least I will have it own instead of just a t-shirt!