I'm fortunate that my clothes still last quite a while, so I don't know what to say. Still have some t-shirts from the 90s, oddly.
I can say that if you wash cottons with synthetics, that will shorten the life of the cottons. If you use any "stretch" or "no iron" clothing, you almost certainly have a synthetic mix. It isn't that they are lower quality. Nor are they designed to not last as long. They are designed for that stretch and to look flat as their main goal.
While it's true that they aren't designed to not last as long, not lasting as long is a side effect of their design decisions.
The primary reason for the tendency of clothing to wear out faster is the textile manufacturing processes allow for the production of thinner fabrics at a cheaper cost per yard. As anyone who sews or knits can tell you, thinner fabric wears out faster. It allows companies like Zara, H&M, Walmart, Rack, et al to sell their product at marginal cost increase for higher YoY profits with a faster replacement cycle.
Furthermore, it's a plainly stated business strategy of fast fashion that fungibility and the production of disposable consumables is core to their business. As that type of fashion cannibalized market share from more traditional brands that banked on quality more than affordability in the 90s, those same brands responded by creating separate imprints ( Off Fifth, Rack, et al ) or just wholesale adoption of the approach ( e.g. H&M ).
Fast forward to 2025 and we're having a conversation about whether or not the quality delta in clothing is real or a Mandela Effect. The reality is unfortunately the more banal "number go up by any means necessary" explanation.
Mostly agreed. This is what I meant by them not necessarily being lower quality. In many ways, it is a by product of the race to super thin threads. Which, amusingly, used to be a sign of ultra high quality. :D
And clothing has always been a consumable. Always.