Canvas.
Canvas has been used in every collection of ours for well over a decade now. Medium-weight and easy to care for, with cotton canvas, you don’t need a loyalty card for the local dry cleaners. Shove it in the washer with some non-bio detergent at 30 degrees, shake it out as soon as it’s done and give it a cool iron if you’ve got the time (or the inclination). It’ll never let you down.