Second hand isn’t always practical. For some things, sure. But definitely not even for most things. And if everyone did it regularly, it’d be even less practical/reliable.
And again, you have a wildly inaccurate view of what most folks are spending on clothes. There’s a reason Walmart and other affordable clothing stores like Target, Kohl’s etc are so widely available and used across the US.
My point is that one person is only able to produce 1 second hand item at a time. So you’re saying roughly 50% of the population gets to buy new and the other must by used. The logistics don’t make sense long-term. I wear my clothes until they have holes in them. I’m not giving that shit to a thrift store, because they legitimately won’t accept items like that. I know there are plenty of other people who do the same. Pants are actually the most consistently relatively expensive clothing item, usually costing $40-60. Because of that, I only own 3 or 4 pairs of pants and when they start getting tattered, they become my yardwork/garage work/etc pants until they legit fall apart. If everyone does this same approach, there isn’t much of a second hand market, no?
The national average wage in the US according to the Social Security Administration is $66k. People are barely able to pay rent. According to various surveys, anywhere from 40-60% of Americans are living check to check. And a quick search shows the most purchased clothing brands include Under Armour, Levi, Adidas, Nike, Hanes, Fruit of the Loom, etc. All of those btands do make items that cost $50+, but they also sell tons of shit that’s $20 to $30 or less.