I have some cotton sheets, unbleached that my husband’s granny gave to us when we married in 1965!! My favorite sheets. She crocheted a little piece on the end of them and it is intact. Over 40 years and good as anything you buy now.
I have read that Porthault sheets which retail for about five grand are handed down from generation to generation like linens used to be. I have a set of linen placemats that my grandmother gave my mother in 1930,,still gorgeous.
We used to iron the cotton sheets and cases,,I no longer do that having liberated myself from ironing!!!