To duplicate the designer collar, I basically made a length of large diameter piping the same length as my collar pattern. The 5/8 inch diameter cord was made by rolling up a 18 inch by 4 inch piece of fusible fleece jelly roll style. Fusible fleece is about 1/8th inch thick, made of polyester, and pretty dense. One side is coated with a fusible adhesive. I use it a lot to make my own shoulder pads. I rolled the fusible surface to the inside, but actually whip stitcheded the edge of the fleece to the roll to maintain the shape. A strip of bias cut fashion fabric 19.25 by 4 inches (which included seam allowances) was used to cover the cording. The ends were finished before the cording was inserted. I treated the collar like piping and inserted it on the jacket collar edge using a piping foot. The fabric is a woven wool with black grey and cream threads from Fabric Mart. The lining is a red and black silk twill print from the same source.
I think my jacket looks remarkably like the designer jacket. What you cannot see are the alterations I did to fit the back of the jacket to my rounded shoulders, and prominent shoulder blades. The last couple of jackets I have made had large circular wrinkles that started on the back where my shoulder blades stick out and came down under my arms and ended at my bust. Adding .75 inches of length to the upper center back seam and putting in small darts from shoulder seam to shoulder blade makes the back fit like a glove and eliminated all the wrinkles. Guess I will have to do this to all my jackets in the future. Getting old is not for sissies!