Measure your papasan cushion from seam to seam. Double that number and add 3 inches for seam allowances and irregularities in the cushion’s shape. Most papasan chairs are 54 inches in diameter and 3 inches thick, but measure to make sure. Fold your fabric in half, right side to right side, and lay it out on the floor. Smooth out all wrinkles. Pin the four corners so the fabric doesn’t slip out of alignment. Place your papasan cushion in the center of the fabric.