100 years ago clothes were expensive items. Which is why they were class signals - less because of fashion and more because if you were poor you needed to buy long lasting fabrics. Clothes for the poor were expensive as well as the rich.
You can buy those same quality items today but nobody will because we expect clothes to be cheap and not have to repair them.
Take flights... For all the complaints about lack of legroom etc the price of a flight 50 years ago was the same as first/business class today. And yet how few people will pay for it. They'll grumble about small seats and bad snacks but hardly anybody will fork out for the upgrade. Not because they can't actually afford it but because they believe it should be cheaper.
When Sears was looted by management, how were consumers supposed to continue purchasing quality stuff from a historic company?
You've got your cause and effect backwards. American companies fired everyone who was paid enough to afford good stuff, and replaced them with workers in other countries, and then those people didn't really have a choice but to buy the junk because it was the only option left on the market and they couldn't afford anything else
What happened was that American business theory abandoned the American worker.