Here's a lot of vintage bed linens, plain white, soft 100% cotton. It's hard to find good cotton bed linens of this quality these days, the vintage sheeting is so soft and smooth and nice.
This lot is three flat sheets, 81" x 108" before hemming, marked double bed size. We like the old red and white blue Sturdiwear labels, this isn't a brand we've ever seen before.
We've found these work very well on the newer thicker twin size mattresses, as top sheets and as bottom sheets with corner clips. (One great advantage to the corner fasteners is that your sheets look so much nicer folded if they're flat, instead of with the elastic corners. Pretty enough for open shelving!)