Like Jan, it's been a thousand years since I've seen one of these. Any that are vintage, I'd think would be too brittle to use. This was a plastic open "circle" that would sort of clip around the waist. The apron could be constructed as a straight piece of fabric and then gathered onto the curvet. It was certainly easier to iron and the put in a drawer than the ones already gathered onto a waistband. This was in the years when every piece of laundry was ironed!