Sewing pattern

I would really like to make sewing patterns from designs. Is there any way of doing this, or anything you can do to make this possible. It would be great for school projects. At the moment Exact Flat seems the only option.

Have you tried sweeping a circular shape along the stitching line?

I haven’t got a stitching line. I’ve got an irregular and bobbly shape and I want to turn it into flat shapes I can add seams to and cut out.