One can try this out also with wearing a black t-shirt instead of a white during a hot sunny day: the difference is quite remarkable.
Best regards,
Thierry
makes me wonder why camera manufacturers don't use some sort of reflective technology on their top end models.i have a black leather riding jacket from jofama which is treated with some form of anti-refective thingie and after a day of motorcycle riding on a sunny day you can really feel the difference vs regular black leather
here's some info on the coating
http://www.tfl.com/systems_cool.asp