Why do people assume that clothes (and other goods, mind you) produced in the US are a mere hypothetical? There are plenty of brands that do so, and your general public overwhelmingly ignores them (and, as you have just demonstrated, don't even know they exist) precisely because they are way more expensive than consumers have been conditioned to believe that clothes should cost.
For instance, actual MiUSA jeans from companies like 3sixteen and Raleigh Denim retail for ~$200+, which is a far cry from the $30 to $50 that most people think jeans "should cost" (and that companies like American Eagle, who have long since outsourced their manufacturing, are happy to provide). Sure, it's not as if MiUSA jeans HAVE to be a few hundred dollars (I believe there are some Gustin's jeans you can pick up for $120 or so), and there are offshored jeans like Levi's which are already overpriced. But you'd have to be very naive to think that there would not be a massive and quite frankly unbearable sticker shock for the vast majority of people if you were to somehow force all domestic clothing demand to be met through domestic production. You could maybe sell it with some very effective austerity propaganda, but good luck with that.
Where did I say there are no clothes produced in the US? That said, I do think there's room to compete of most US clothes were produced domestically and that the pricing could come well below the existing US brands.
There's also brands made in China for cheap with Euro brand labels attached that sell for several hundred. Cost is not the same as price.
For instance, actual MiUSA jeans from companies like 3sixteen and Raleigh Denim retail for ~$200+, which is a far cry from the $30 to $50 that most people think jeans "should cost" (and that companies like American Eagle, who have long since outsourced their manufacturing, are happy to provide). Sure, it's not as if MiUSA jeans HAVE to be a few hundred dollars (I believe there are some Gustin's jeans you can pick up for $120 or so), and there are offshored jeans like Levi's which are already overpriced. But you'd have to be very naive to think that there would not be a massive and quite frankly unbearable sticker shock for the vast majority of people if you were to somehow force all domestic clothing demand to be met through domestic production. You could maybe sell it with some very effective austerity propaganda, but good luck with that.