Comment by piffey

Outside of what has been mentioned here (thanks folks for some new brands) I've found clusters in Canada and Portugal of great clothing brands making quality products with good materials:

Canada - Anian (https://anianmfg.com/) for wool products. - Reigning Champ (https://reigningchamp.com/) for cotton tees.

Portugal - La Paz (https://lapaz.pt/) - Isto (https://isto.pt/) - Portugese Flannel (https://www.portugueseflannel.com/)

I also like this site No Man Walks Alone to find quality brands. It is about learning how to spot quality though in stitching and fabrics. Wish there was more educational materials out there on this.