I hate polycotton/ synthetic fabrics so I don 't buy it. I just can't understand why you think buying 100 % natural fabrics is any kind of problem?
All my shirts, are either pure linen , T shirts pure cotton. Plus I have a few pure silk blouses. All our towels are pure cotton; our 35 yr old summer duvet is pure wool, and our sheets duvet covers andpillow cases areall either pure linen or pure cotton. Even the tea towels are pure linen. All dh's socks are pure wool. My thick winter socks are all pure wool, summer socks are cotton. My nighties and underwear are pure cotton , my trousers are either cotton or linen.
Pure linen is very hardwearing and lasts forever so it's a very economical/ sustainable investment. Vintage pure linen mens shirts are very often sold in charity shops; from the style the previous owner has died of old age but his shirt will last another lifetime on DH, who snaps them up for a pound or two. It's less common for find ladies linen in charity shops ( I grab it if I can!) so every year I buy myself one new linen shirt. I've been doing this for nearly 40 years so have a huge collection; all still perfect and still in regular use.
We machine wash everything.