I don't have any ideas on jackets....but I do have a suggestion
Look for one that isn't black.
Was out for a cruise yesterday, running down the highway. After a stop, I took off the leather sleeves off my Joe Rocket jacket. The jacket is black leather, with removable sleeves, but the mesh underneath was black.
While it was a bit better, it wasn't as good as I had hoped....the black mesh also attracts heat, in spite of the mesh.
I may start looking for a lighter mesh coloured jacket...it's only May here, & its going to get warmer, I think.
Good luck in your search!
C