To determine the cut length of the fabric, add the length of the cushion, plus twice the height of the cushion plus 1 inch. For the cut width of the fabric, add twice the width of the cushion to twice the height of the cushion plus 1". Measure, mark and cut one piece of fabric to these measurements.
Fold fabric in half lengthwise, keeping right sides together and raw edges even, and pin long edges together. Mark zipper placement in center of pinned area; sew from end to end with 1/2-inch seam, using basting stitches in zipper area. Press seam open. Center and pin front side of zipper to pressed open seam between marks. Baste 1/4 inch from seam on each side. With right side up, sew over basting lines to attach zipper. Remove basting; open zipper several inches.
Turn wrong side out, centering zipper seam along one side. Pin and stitch across each end with 1/2-inch seams.
To make squared corners, fold fabric into a point at one corner, centering the end seam, forming a triangular flange. Draw a line the same length as the cushion height where the flange meets the main body of the fabric, perpendicular to the seam. Stitch along the marked line. Mark and stitch each of the four corners in the same way. Trim corners 1/2 inch past stitching lines.
Turn right side out and insert cushion through zipper opening. Zip to close.
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