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Here's an idea from a class participant: Take two coordinating ties that are clean and pressed. Cut them at about 24" from the wide end (longer or shorter depending on your preference). Trim away about 1/2" of interfacing from the cut ends. Finish the raw edges and sew the ends together. Drape over your neck as a scarf or lapel over a V-neck jacket. Fasten them together with a decorative pin.
When you are making a sweatshirt jacket, plan to try it on before finishing. After you have covered the pieces and "quilted" to your satisfaction, trim the pieces and baste them together with the seam allowance you plan to use. Try on the jacket to see where you might need to make further adjustments. For example, you might want to indent the waist a bit at the side seams, make the sleeves shorter, tighten or loosen the neckline, shorten the jacket, or even add a simple collar.