1.cut front size of finished cushion PLUS 4 widths of flap PLUS seam allowances. Turn in edges to size and mitre them. Cut a two piece back, inserting zip under a flap either centrally, or so edge of flap is at the inner edge of the Oxford bit, and finished size of back is cushion size PLUS seam allowance. Put back under flaps of front, turnin seam allowance of front, and satin stitch all round.
2.Cut front and two piece back(as above) size of cushion PLUS 2 widths of flap PLUS seam allowances, make up in the usual way, top stitch round the cushion size.
Depends if you need contrast borders or not. Is this clear? It's very late.
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