I've gotten a lot of compliments on how long it must have taken me to construct it. In fact, it only took a couple hours.
One of the benefits of using the full width of the cloth is that I didn't have to hem the sides - they came already finished, so that they wouldn't unravel. I simply had to hem the top and bottom.
This fabric also had a clear right and wrong side. The black is the right side, while the red is the wrong side.
The first thing I did was pleat the edges. These I measured out so the folds would be even and both sides would align with each other. Eventually I turned those pleats inside out, forming the red, triangular highlights. (Incidentally, this is totally non-historical.)
Once this is done, flip the fabric over so that the wrong side is face up. Find what is roughly the vertical center of the fabric. Pinch the fabric somewhere along that line and lift it up (toward the waistband) several inches and safety pin in place. Move to a point father down that central line and repeat. This created the poofs of fabric on the right side of the garment.
The image on the right is the wrong side of the garment. See how the fabric has been pulled upward at regular points along the central axis. When you're happy with the look, sew the points in place.
Because this was built from a rectangle of fabric, the bottom looked very square and unfinished. The solution was simply to fold the bottom corners under to provide a more curved bottom edge to the garment.
The pinching, lifting and pinning done here is the same process used to create the back of my Bustled Overskirt.