A zipper can be a handy way to add a removable slipcover to a throw pillow. Choose a zipper that’s about 2 inches shorter than the side of the pillow where you want the zipper. Although the zipper won’t show very much, it’s best to pick a zipper that matches the fabric as closely as possible. If you don’t already have a throw pillow to cover, you can buy plain pillow forms in many fabric stores. You can use upholstery or home decor fabric to cover the pillow–or plain or printed cotton fabric. If you want the pillow case to be washable, make sure to choose fabric that isn’t dry-clean-only, and pre-wash, dry and iron the fabric before making the pillow case. Measure the pillow from top to bottom and side to side. Make sure to measure from the center of the pillow’s edges, so that the pillow’s thickness is included in the measurement as well. Cut a piece of fabric that’s 1 1/4 inches larger on each side than the measurements of the pillow. Cut a second piece of fabric the same size as th