I find it quite weird that people can feel good wearing clothes where the manufacturing process and supply chain etc is unethical - where people are paid poorly for their labour and no concern is given for the environment.
There is far more accessible information available these days, so we can all educate ourselves about it.
We all need to consume less, most of us have way more than we actually 'need' and so much clothes are in circulation already.
I started buying clothes in charity shops years ago as a teenager (1980s) and continued to do so when bringing up children as a single parent. I now earn a decent salary, but I still try to buy most of my stuff secondhand. I find it more enjoyable and fun to see what I can find.
There are lots of companies making ethical clothes now They usually cost more, but that's not such an issue if we try to buy less, so buy better quality, a lot less often.
I understand it's not easy if you have children and you're on a low wage. Lots of secondhand kids' clothes available though on Facebook, e-bay etc!
I still manage to get most of my clothes in charity shops, Vinted or on e-bay. Doesn't always work out, some items occasionally don't turn up or end up back on a selling platform or charity shop, but I'd rather do that than buy new.
Another good option is to learn to sew with a sewing machine, even with a basic machine you can alter clothes easily so they fit better, mend them so they last longer or make a few pieces yourself!