A square cushion cover is a fabric cover designed to fit over a square-shaped cushion, providing both protection and decoration. The size of the cushion cover will depend on the size of the cushion it is intended to cover.

For a square cushion cover size of 16×16 inches, the cover will typically be made from two squares of fabric, each measuring 17×17 inches to account for the seam allowance. The cover can be made from a variety of fabrics, including cotton, linen, or synthetic materials, depending on personal preference and the intended use of the cushion.

The cushion cover can be customized with various design elements such as piping, decorative buttons, or embroidery to enhance its aesthetic appeal. It is typically secured with a zipper or buttons, and can be easily removed for washing or changing out for a different cover.