This is my technique for making up a cushion. It is super easy. The finished back will be double thickness. I do this because I always use dress/craft weight fabric for my patchwork (not furnishing fabric) and this double thickness makes a stronger, more durable back for the cushion and it is more crease resistant I find.
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For this example I will be completing a 14″ x 20″ cushion. Once you understand the technique you can adjust measurements to suit the size cushion that you require.
1. For cushion back, cut two pieces of fabric 14.5″ x 22″. Fold each piece in half so that you have two pieces 14.5″ x 11″. Press and sew a line of stitching ¼″ from folded edge and another 1½″ from folded edge.
2. Bring each piece of fabric together at folded edges and overlap by 2½″ to make a cushion back 14.5″x 20″.
3. Sew buttonholes along one side of cushion back for cushion fastening. I sew three, evenly spaced apart. Alternatively, you could sew a strip of Velcro to either side.
4. Place cushion front (which will be 14.5″ x 20″) and cushion back right sides together making sure that buttonhole edge is the edge tucked underneath (next to right side of cushion) and sew around all four edges.
5. Trim corners, turn through and press. Sew buttons on back opening to correspond with buttonholes..