Uniqlo and Patagonia specifically test their products through wear and tear and wash//dry cycles sources (others, too) - https://www.newyorker.com/magazine/2025/09/22/inside-uniqlos... and Let My People Surf. I think most other stuff we commonly see at retail has degraded to fast fashion and meant to only last a short time. The lifetime warranty and repairs offered by Patagonia speak for themselves I think.