The shortest piece should be a little longer than your hip circumference. I folded over and sewed a drawstring pocket along the top edge. Then I gathered the second piece and attached it to the first, and gathered and attached the third to the second. Finally, I sewed up the side seam and inserted my drawstring. And this is how it ended up. I liked it all right, though in retrospect it is kind of an awkward length. And I wasn't terribly fond of the drawstring.
So I pulled it back out a few weeks ago and decided to go shorter and fuller. All I did was chop off the bottom tier and sew it back on a couple inches below the waistband. And I removed the drawstring and inserted a piece of elastic instead.
And how about a close-up of that texturing? The new second layer helps maintain modesty too, given that those wider textured stripes are a looser weave than the rest.
I like it much better now. It's fun and flowy, and the elastic is much more comfortable too. It makes me want to twirl!