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Sewing the slots
Be careful not to sew over the tie. It should be just above where you're sewing but parts of it can get in the way.
The closer you get to the actual edge with the outermost stitching the better that pocket will be. Fortunately this is not designed to super-exacting standards.
Sewing from the top of the pocket down makes it easier to take the work out of the machine when done.