About fifteen years ago I read in a book (Physics by James Walker 3rd edition) that dark brown color reflects IR better than any other color and consequently weather heat since our bodies get most heat as IR and therefore wearing very dark brown clothes (almost black) helps keep the body cool.
He went so far as to show picture of Saharan Bedouins walking between sand dunes and dressed in very dark clothes on a sunny day as proof that they knew it was the perfect color through the generations. Since I spent most of my life in the hotest spots inthe planet,
ever since redding that I've been wearing dark brown clothes most of the time despite the fact that all people around me wear white clothes and drive white cars and dispit government media warnings and advice to wear white clothes and dispit the fact that I always felt uncomfortably warmer in brown clothes and the fact that since middle ages women in the midle east wear dark colors due to a famous verse of a poet flirting with his lover when he saw her in black clothes in Baghdad I couldn't trust my senses and general knowledge nor the public media more than a university physics book I picked from the university library.
Today I was thinking of using crystals to split a green leaser but I found out that the result will be in the IR range and then I did a small experiment with an IR remote and phone camera to see which color is appropriate to observe reflected IR.
The first picture is IR on a brown smooth door and the second is on a white wall (due to curfew I couldn't get colored cards of the same material)
The brown door has a glossy surface layer that reflects light more than the wall so the first image should have been even more darker.The upper bright spot in the first picture shoud be neglected because it appears with visible light as well and its a result of the glossy coating. only the lower dimmer region similarin shape to the one in the lower picture should be considered.