Researchers have discovered that waste from the global apparel industry is leaking millions of tons of plastic into the environment each year and may be getting worse over time.
I switched to cotton t-shirts 5-10 years ago, thinking the same thing. However my first set of cotton t-shirts has worn out and needed to be replaced, whereas I still have polyester t-shirts from before that that look much nicer.
Polyester has advantages in durability, stain resistance, wrinkle resistance, and can be much thinner and lighter. I’m not entirely sure cotton is really better