The problem here is synthetics are generally considerably less resource intense than natural fibers, I looked into cotton vs polyester a couple of years ago https://www.ryanmercer.com/ryansthoughts/2016/7/19/environme...

While the synthetics and artificial fibers are bad as they pollute the environment downstream, cotton production requires roughly 20,000 liters to produce 1kg of fiber while polyester requires SEVENTEEN liters of water.