Fold the skirt’s right sides together aligning the raw edges of the back panel. Measure and mark 8” for the placket. Sew from the mark made for the placket to the hem of the skirt.
Fold the placket in half and find its center. Pin the center to the back skirt seam so that the right side of the placket is touching the wrong side of the skirt. Pin the placket along the opening. Sew in place.