If you live in or have a neighboring town that is middle or upper class (does not apply to super rich geographies) the second hand stores often have really nice quality clothes for dirt cheap. Church charity shops in the same geographies are a good resource too. I find that you ‘know it when see feel it’ in terms of which clothing items will last a long time. Better fabrics are usually a bit thicker and sturdier feeling.

Not ideal for undergarments or socks though.