I suspect that, if we want a more sustainable ethos behind outdoor gear, moving away from ‘fast and light’ and returning to more durable face fabrics would be a significant step in the right direction.
I’m not sure that durability – ie: kit being replaced because it’s actually worn out – is the driver here. More classic consumerism with people ‘upgrading’ to the latest, ‘better’ wonder fabric or design. Also, for several years, Mike Parsons who ‘was’ Karrimor for many years, ran a regular conference on innovation in the outdoors industry, which rapidly became more about sustainability in the outdoors industry. Mostly it emerged that sustainability is very complicated and the ecological and environmental costs of a particular product aren’t always where you think they are in the process.
Ultimately the most sustainable thing you can do is simply not to buy more stuff. Don’t buy new bikes, clothing, tech, just use what you have, repair it, upgrade it. I don’t believe with outdoor clothing that many people – guides and instructors excepted – regularly wear it out. People just upgrade.