This buttonhole is a triangular opening that I made in a piece of woven silk using some silk organza as a facing to finish the raw edges of the triangle. The inset pieces are cut of silk shantung and the "lips" are finished with corded piping cut on the bias from a striped dupioni.
This buttonhole sample was really fun to make! I have used all different shapes and fabric combinations over the years to make cool bound buttonholes! (explains why I never learned to golf!) Just think about how the dreaded bound buttonhole could be your new passion!