Left: The side panels are gored on each side. It measures about three inches at the top (there's a small pleat at the waistband) and nine inches at the bottom. The pleats are in this panel, which causes the side back seam, which is also gored, to curve slightly towards the front. The right side panel is pieced with a tiny, about half inch, triangle of fabric at the bottom back corner.
Right: The velvet ribbon is extremely soft and has a wonderful drape.
The silk fringe not only trims the bottom of the skirt, but the back opening as well. This would have been well suited to the elliptical crinolines of the late 1860s which were fuller in back than the bustle shown.
The skirt has no closures along the opening. An extention of figured silk is sandwiched between the lining and silk to cover any gapping, however the opening stays together quite well and the placket can't be seen.
A detail of how the pleating affects the hemline. It folds in on itself just a little.