As per usual, I thought I'd start from the inside out. I went into the stash, to look for fabric for a petticoat, but I didn't have any. I was about to go to the store, but thought I should check the petticoats I have first, just to see if anything would work.
Major face palm!
At some point last year, I already made the petticoat! How I forgot, I have no idea, but here it is!
Yay! One down. Now on to the rest of the outfit.