> I wish there was a line of brands and even better shops that focused on quality fabrics and sewing processes for clothing that lasts for ages as it used to.
They still exist, at least here in Europe.
I quit buying cheap clothing a decade ago, getting quality items is much more expensive but at the same time I've had basic t-shirts that I wear most days last me 5-8 years; trousers that are almost 10 years old and the only blemish is a bit of faded colours; underwear lasting 5+ years, etc.
The issue is very few people have the disposable income and are willing to pay 40-80€ on a good quality t-shirt with heavy premium quality cotton (280-300gsm) sewn in Portugal, Spain, or Italy, or 45€ on a 3-pack of underwear made in Scandinavia, or 20-30€ on a pair of great quality woolen socks.
I do it because I have experienced how much longer they can last, and also had the experience of overpaying on what seemed to be a good quality item and didn't last, it's really hard to find a good signal for what's quality since price alone doesn't do it, you need to buy the stuff and hope it will be good quality and if it's not you learn to not buy it again, it can get expensive if you are unlucky or didn't do proper research.
In the end it can be exhausting for a normal person just looking for good quality to find those items, it took me years to settle on the brands I buy from.