The Yearly Haj Pilgrimage in Mekkah

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The best color to wear in the sun depends on your purpose. If you want to protect your skin from UV radiation, you should wear black and dark colors1234, especially dark blue2. If you want to keep cool in the heat, you should wear black and loose clothing5that allows air to get to your body. Bright and vivid colors like red or neon green can also help with UV protection4

Why would you wear the one color (black) that absorbs all of the colors (and energy) of the visible spectrum, if you want to keep cool?

Acceptable Hij wear?