We shouldn't accept climate change as inevitable or stop trying to effect change. That said, what sort of clothing is out there which might help as we feel more negative effects?
The main thing I'm thinking about is dealing with heat, but I guess part of the question involves a little forecasting about the types of challenges people will face in the future.
The best clothing for a hotter environment is a tad counterintuitive, because it's less comfortable in the short term... you want full sleeves, full pants or a long skirt/kilt/toga/whatever (I'm reasonably certain that if heat waves continue cranking it up, these are going to become a unisex thing, whatever we're gonna call them...). You want everything loose so there's room for evaporation to happen (it's your body's natural swamp cooler), you want large openings everywhere so the air can ventilate, and you want lighter colors that reflect. You'll also want to cover your head, preferably withsomething wide (and/or includes the little neck covering flap deal) that creates a lot of shade, but it's currently more common in deserts to see less shade producing scarves/wraps.
You'll feel hotter in the immediate, and overdressed, but you'll overall be absorbing less energy from direct sunlight, and that means a more stable amount of body heat overall, and less risk of things like cancer.
I wear loose t-shirts, jeans, and a wide boonie/fishing hat. Less overall clothing is better, but more coverage is also better. Gotta find that balance is all.
TL:DR, the clothes most people associate with the Middle East... clothes that are worn by people who've dealt with a hotter climate for millennia. The white robe looking getup is what's gonna work best in a hotter climate.
It's not just the material, it's the specific weave too I think?
I'm not originally heat tolerant, personally, so when I visited Cuba I brought a lot of linen clothes and they did wonders. Just pants and tunics, and a brimmed hat. I looked like a drug lord but never overheated.
Well, or even more effective, just put your clothing into water. I even have a vest that is specifically designed for that:
You'll put it into water and evaporation is keeping you cool with a relatively stable temperature. For example: I sat around a few people who were clearly not "enjoying" the heat, while I was quite comfortable (and I'm really sensitive to heat and would normally escape hot places instantly).
I think one of the questions we need to ask ourselves, more than what to wear, is the sustainability of clothing manufacturing.
What companies make clothes in a sustainable and environmentally friendly way?
My go to has been Patagonia. They do a lot to help with sustainability, the pay better wages than most manufactures, and their reuse/recycle programs are great.
I’ll admit, their products can be expensive so it might not be an option for everyone. However, every piece I own has lasts for years and is very high quality.
No, he created a hedge fund structured as a 501(c)(3) to avoid paying taxes on inheritance for his family. The “non profit” may do some good while in the process of tax sheltering a billionaire’s estate, that’s not the primary purpose of it.
A good razor to take off the full-body sweater. Somewhat joking but there's enough good advice here already and I'd be lying if I said some hot days didn't have me reaching for the shaving cream. It's just the thought of the horrible itching during regrowth that holds me back.