on the bright side, cotton is a lot more durable and lasts longer.
Another problem is fast fashion. The fashion industry is a bit of a cancer on the planet, encouraging chains like H&M to sell very cheap clothes filled with plastic, that people need to replace every few years.
Well, it depends. Certainly nylon and polyester can be vastly stronger than cotton, that's why they're used in many garments requiring mechanical durability. (Heck, ballistic nylon is a thing; you don't hear about ballistic cotton!)
But sure, it's also true that you can make extremely low-durability clothing from synthetic polymers that aren't even intended to last (ultra fast fashion is incredibly destructive, yes).
Another problem is fast fashion. The fashion industry is a bit of a cancer on the planet, encouraging chains like H&M to sell very cheap clothes filled with plastic, that people need to replace every few years.