Too bad you couldn't find a real cheap jacket that you liked the design of, then deconstruct it and use the pieces as your pattern. My mom used to do this all the time if she found a garnet she loved, then would make it with different fabrics. Or she would take it (usually a dress) apart, trace the shapes onto newspaper for pattern fabric and re-sew the original garment. Then when it woreout or whatever she could sew another one.
"Opportunity is missed by most people because it is dressed in overalls & looks like work" - Thomas Edison