Now that the seam allowances are all pressed under, sew the two large pieces of fabric to each other, with wrong sides together, close enough to the edge that you're sure to catch the seam allowance.
Next, sew the top edges of the pocket fabric, making sure that the seam stays double-folded so the raw edge is on the inside and that you sew close enough to the edge to catch all layers of fabric.
Then stack the pocket fabric pieces, with the shorter one on top and pin them to the larger pieces, lining up the sides and the bottom edge. Take your piece of ribbon and pin it underneath the pocket fabric, centered on the side of the longer pieces.
