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Pieces from recycled silk ties will be more durable if they are interfaced before use. If you are planning a project that will see a lot of use, consider using a light-weight fusible interfacing (or underlining) on the pieces either before cutting, or on the complete unit after construction. You will not have a problem with fraying edges or seams this way.
It's fairly easy to add a simple collar to a neckline. After sewing the shoulder seams, measure the length of the neck opening from center front to center front. Cut a rectangle a couple of inches longer by 7" wide. Interface one half (the facing) and baste that raw edge to the right side of the garment. Turn the opposite raw edge under 1/2". RST, sew the ends of the collar even with the center fronts and trim. Turn and sew the folded edge over the seam. This collar will not form lapels.