The share of household spending on clothing has gone from 10%+ to under 5% in Western countries. When you're spending that much, it's not a surprise that clothing was "BIFL" both in quality and upkeep (repair rather than replace).
The overall revealed consumer preference has been "more and cheaper", not "less and higher quality", which still exists as a niche if you are willing to go down the tailoring route, not off the peg.
That's not actually "revealed consumer preference" for quantity over quality. It's just that it's impossible for the average consumer to assess quality.
The thing is mainly there are no quality options available. It's mostly all cheap shit or slightly more expensive, but still equally shit. So how can this reveal preference if there are no options?
I would argue the surge in vintage clothing ecosystems is an indication there is an unmet demand.