Add one inch to both length and width, and cut the main fabric to that size. If you place the open notebook in the center of the fabric, you should end up with a half an inch of fabric all the way around it.
Cut the lining fabric to the same height as the main fabric. The width will be longer.To calculate the width of the lining fabric, decide how wide you want the pockets for the notebook to be. Multiply the desired width of the pockets by four and add that number to width of the main fabric.I wanted the pockets to be around 3 inches wide, so I added 12 inches to the width of the main fabric. (3x4=12)
Place the two fabric pieces together, right sides together, and sew the side ends together on either side. You will end up with a long, inside out, tube.
Position your tube so that your main fabric is centered on top.
Sew across the top and bottom, leaving a small opening on one of the two seams. This gap will allow us to turn everything right side out again. (Notice the gap in the bottom of the photo.)
Flip the fabric right side out again, and sew all the way around the rectangle of fabric. When you reach the gap, fold the edges of the fabric under and sew over that part closed.
Fold the lining fabric over along the line between the main fabric and lining fabric on either side. This forms the pocket into which we will slide the cover of the notebook. Hand stitch along the top and bottom seams to secure the pockets in place.
Slip your notebook into your newly finished notebook cover!