How to Dress for Extremely Hot Weather (Seriously)
Having said that, here is some genuine non-sarcastic advice for people sweltering under unusually hot temperatures, specifically conditions that are hot and humid: ignore everything you've ever heard along the lines of "Cotton is a comfortable fabric in hot weather." That might be true for hot and dry climates -- I've never actually lived in one myself, so I wouldn't know -- but cotton is terrible in humid conditions because it hoards moisture, and feels wet too.
Up north, anytime there was a brutal winter cold snap, there would always be "news you can use" stories advising how to dress in layers against the cold, and those stories always said "Do NOT wear a cotton layer closest to your skin, because if you perspire the cotton will stay wet and ironically increase your risk of hypothermia." Despite this, it took me much, much longer than it should have, to figure out "Hmm, so, if cotton makes you feel wetter and sweatier in cold weather, perchance might it do the same in hot?"
The two fabrics you want to wear in hot and humid conditions are linen or rayon (also sold as "viscose" or "bamboo.") Linen is a more high-maintenance fabric -- it wrinkles if you look at it too hard, and (at least on me) somehow always manages to look baggy and ill-fitting even when a garment is cut to your precise size and shape. Rayon has some advantages over linen -- not nearly as high maintenance, and many forms of it do not hold ANY body heat at all, making it ideal for high temperatures -- but according to an article I read, some people dislike rayon precisely for that reason: they say the "cool" feel of the fabric on a hot day can come across as almost "slimy" to the touch. I wouldn't know about this, however, because I only wear rayon on days sweaty enough that EVERYTHING feels slimy, since I'm touching it with a damp and sweaty hand. Also, I've noticed a wide variation in quality between various types of rayon -- some of it is so nice, it looks and feels identical to silk, linen or cotton; some is so cheap it looks more like that rubbery polyester used in really bad 1970s leisure suits.
For days when the temperature would be pleasant except the humidity makes it too hot (or a tiny bit too chilly), silk is an excellent fabric: it stays dry to the touch as does linen or rayon, but holds noticeably more body heat than linen or cotton of similar thickness, meaning even very thin silk is best avoided in high-heat conditions.
Under NO circumstances do you want to wear nylon, spandex or polyester in hot humid weather. Even cotton is better than those three.
End message. We now return to your irregularly scheduled programming. Trump sucks.