I used to wonder why Sky team wore black jerseys, turns out the black dye is "sublimated" so it absorbs less sun & also the fabric has titanium dioxide particles which reflect a lot of sunlight & help SPF. So they are virtually same comfort as white jerseys.

Last couple of years I've seen more runners & bikers wearing compression tights in the summer, both black & white. Hmm, biking with white compression tights looks a bit weird: I look to see if there are black sublimated tights, only info I see is about custom printing.