If you wear more classic mens clothing you can dress pretty much 100% in linen, wool, cotton, silk, leather and various brass/steel buckles. 100% merino wool (winter) or linen/cotton/silk blend (summer) for socks, underwear and t-shirts. 100% cotton and linen for shirts and trousers. 100% wool knitwear, suits, formal trousers, jackets and winter coats. 100% leather shoes.

Not to mention the clothes themselves last decades.