I've been wondering whether it'll be possible to make skin-friendly formulations of the sky-cooling paints, which might help with this sort of situation. NightHawkInLight just released a YouTube video about a way to make a version of the pigment using items from the grocery and hardware stores, and the final result was Calcium Carbonate nanospheres. It seems like it should be possible to make a skin-compatible paint from this, much like the titanium oxide based sunscreens, with the advantage that this one would actively cool you by about four degrees centigrade, which is really quite a lot in this kind of scenario.