The common belief If you're trying to shop more sustainably, you've probably heard the advice: choose natural fibres over synthetic ones. Cotton good, polyester bad. It's a simple rule, and it feels intuitively right. Natural materials come from plants and animals, they've been used for thousands of years, and they'll break down when you're done with them. Synthetics, on the other hand, are made from petroleum, they shed microplastics, and they'll sit in a landfill for centur