Seat Covers For Buckets W/O Head Rests ?

I recall seeing slip covers for low back buckets on ebay but they weren't cheap.
Years ago I would use large terrycloth towels in our daily driver. Sew [X] spots to create a pocket for the seat back. Easily tossed in the wash or replaced. The Gremlin with Levis upholstery had some blister your back metal buttons in the seats. Those were high back buckets. Beach towels worked well on those.