For a crisp and casual accent, cover outdoor folding chairs with red-, white-, and blue-striped canvas fabric (ours is acrylic-coated so it won't fray).
For two chairs, each about 13 inches wide, we used 2½ yards of 32-inch-wide fabric cut lengthwise and trimmed to fit. Five-foot lengths of ribbon, tied with a neat bow, secure the fabric at the back of each seat and at the top of the front legs.