Lots of interesting stuff here. I applaud you summarising so much of what is a very large and beastly topic! There really is a lot to cover. Fabrication and textile development being made sustainably is a huge and interesting topic- cotton in your example is interesting because there are organic cottons on the market but it can actually be more resource heavy and produce less yield than traditional pesticide cottons. Leather is really considered a byproduct or coproduct of the meat industry and I think can’t really be looked at without that wider context.
Other parts of the supply chain are a bit more black and white for me, in ethical terms, but textile production still needs a lot more conversation and development.