1950s vintage red bandana print cotton fabric, quilting or a light shirt weight. This was used as a tablecloth or something similar, as it's two 36" widths sewn lengthwise to make a piece about 70" wide and a little over a yard and a half long.
It looks good, without spots or fading, though it's been washed. The ends are unhemmed. Great for western cowboy or rockabilly style for girls or dudes!