So this is the next look that I'm going for, from The Tudor Tailor:
I was hesitant about doing a flounced skirt, which would require a bumroll - it seems odd to modern eyes - but it turned out ok:
However, I totally guessed on how to do the skirt. I measured down from the waist, over the bumroll, about 8 inches, made a tuck about 1 inch wide, and ran two rows of loose stitching to gather it. The fabric is a teal-colored wool gabardine that was left over from another project from a long time ago.
Since it's an open front skirt, I might make some sort of forepart to go under it, to hide my corded petticoat. I wish I had the time and fortitude to do something in blackwork, but that's definitely not my strong suit.