When I was working on my 1920s dress, I sketched several things that incorporated this skirt from Modern Pattern Design*. I didn’t end up using it, because the scallops didn’t suit the geometric embroidery on my fabric, but I still think it’s a fun design element – maybe someone else has a project for it. The diagram shows how to modify a straight skirt to introduce flounces. (This is probably obvious, but in the diagram cb labels the center back and cf the center front.) The diagram is a bit confusing, but the concept is simple: if you put a circle skirt into an uneven waistband, the fullness will be unevenly distributed, creating flounces.
* A wonderful 1942 pattern drafting book by Harriet Pepin. A copy is available online.