Hope you're ready for a lot of information! In this video I go through everyday and environmental pros and cons of materials you likely own or will see in stores. Read those labels! ;)
Each fibre has different benefits and a different environmental impact. There definitely are more sustainable fabrics than others, but it's also good to choose fabrics that fit the intended purpose of the garment. For example, a summer top should be breathable, athletic wear durable, a rain coat water-resistant etc. and also choose materials that fit your lifestyle.
Sorry this video is so long, hopefully it's not boring. To make it easier these are the fabrics I talk about with timecodes to skip to the ones you're interested in: