I don't use a template for vines. I starch yardage, then cut bias strips of fabric that I run through a Clover bias-making template. This folds both edges towards the center. (Starch helps keep the folds crisp.) These are very flexible and I just pin or glue-baste them into position along with the flowers. From what I saw of Aunt Millie's vine, this technique would well for it.