Making the back cushions was the only complicated part of this project. Once I figured out the length of the tabs and how to set the snaps, it was a breeze.
1. The first thing I did was take apart the old back cushion and trace it on the new fabric.
2. Make the snap tabs using the old pattern.
3. Cut bias strip 1 3/4" wide for welt cord. See my welt cord tutorial.
4. Starting at the center of the bottom I stitched the cording all the way around the front piece of the cushion, clipping corner turns as shown and finishing the cord meetup as shown in the welt cord tutorial.
5. Baste snap tabs in place on the right side of the cushion back. Now is the time to insert the snaps. Using old pattern, mark where snaps will be inserted. See DIY: Ten Minute Snap Workshop.
6. Pin front to back, right sides together and stitch all the way around, clipping corners as needed to release fabric. Leave an opening in the bottom of the cushion cover approximately eight inches long.
7.Roll up old cushion and insert it into new cover, filling out corners with extra dacron. Pin opening closed and handstitch the opening with upholstery thread.