I asked the seller some questions about sizing and here are the measurements he posted, FWIW.

The total length from the waist to the hem (selvedge) is 23.5". From the center of the top buckle to the hem is 21". I gave my kilt maker a bunch of measurements. A critical one was from the center of my knee cap to navel. For me that is 21.5 inches, I think that is the "drop". I'll take as many measurement that you want just let me know. Here are some more: Rear fabric from waist to hem 23.5 ".......... Front waist to hem 23".............Waist to center of first buckle 2"..............center of buckle to center of next buckle 3.5"........................... Width of straps 1".............................. Depth of lining from waist to bottom 9".................Width of pleats 1"...............Depth of pleats 5"......................The pleats run all the way to waist and are sewn down to 8.5 inches. ................Apron width 22".