Try this:
www.brosh.com This Israeli company makes a wide variety of biking clothing, including hot weather gear that is lightweight and cool, but still provides protection. Look at the Ultra CK and Ultra CK Sport jackets. Very affordable too.
Here's a tip: for some odd reason, these jackets have a healthy portion of black, which absorbs heat. My guess is this is done for style reasons. But the company is accommodating (at least they were when I bought) and will make whatever color combos you want. I wanted silver on silver for the most heat reflective properties.
Happy trails
