I’m finally near the end of my marathon introduction to Burda patterns and could use some help with the single buttonhole. On the face of the jacket is a band with a hole for the large button created in a seam. I am instructed to cut the jacket facing open and clip at angles up and down each approximately 3/16 in. Long at the ends. Turn cut edges under and sew to seam allowances of band attachment seam by hand. Any thoughts on this? …. Maybe Rita61 and or Kate?