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Seam allowance of 1.5cm on every seam
Cushion height of 2inches = 5.0cm =>8.5
Cushion width of 108cm
Cushion depth of 50cm
Piping requires 5cm
Thinner cushion means we get 2.5 lengths
of piping and of side
Notes on sewing the thing
The edges and allowances given mean that if you align the outside edges then it all works pretty well
Turning the corner:- once you know where the corner will be (2 to 3 inches out when doing the piping), mark it on the piping and make TWO cuts, just each side of the corner. DO NOT cut right at the turn
After the top is done, cut a 45 degree across of the top fabric only, so that the two cuts in the piping DO NOT line up with the closest approach of the top fabric
Once the side is sewn on, possibly an idea to iron a crease before fitting the bottom
Fill the bottom bobbin before starting for real
Sew up the edge strip with an extra piece to extend to 3.5m before starting to apply the edge.
Ditto for the piping strip, therefore, you need to cut ALL the long strips before starting.
Cutting order:- narrow, mix and ONE wide strip, then produce the cushion tops from the other selvedge, then make the last side strip