Measure each cushion and cut a tablecloth to fit, adding 2 inches to each side for sewing. Try to get as many cushions as possible from one tablecloth.
Pin three sides of one cushion cover together, with right sides facing each other. Leave the fourth side open so the cushion can be inserted into the new cover when it's complete. Repeat this step for all cushion covers. It is easier to have all the cushion covers ready to sew at the same time.
Sew three sides on each cover with a 2-inch seam. Turn each one inside out. Add the cushion to each cover.
Sew the open edge together and cut the excess material off or fold the edges in and sew together. Repeat this step on all cushions.