Unfortunately the textile industry is a big offender in modern slavery/human trafficking and bending regulations to pollute the environment. Clothing manufacturing didn't only move overseas for cheaper labor, but because it took the pollution involved outside of western countries and their stricter regulations also.

So it's good to make what you do have last. I wash most clothes in cold water, on the gentle cycle, and my clothes that aren't visibly dirty, I wash them in Woolite, which helps them last longer. One of the most basic things you can learn is mending clothes and basic repairs like sewing on buttons and zippers. You can do most repairs by hand, with just a needle and thread. Darning is a very easy method to repair clothes. I can't afford many of the more ethical and quality brands new, so I thrift a lot. There's a lot of advice on here about thrifting. I shop at benefit and charity thrift stores, not Good Will, so at least my money isn't directly supporting an unethical fast fashion company.