Since I already finished the crinoline for this outfit, I was able to progress to the overskirt. Not having a finished crinoline really blocked me from going on: How to hem something if you don't know how much longer the skirt has to be to still touch the floor? How wide do I have to make the waistband if I want to be comfortable?
You see that I needed to get the crinoline done and then move on! The pattern for the base skirt is a simple circle skirt with approximately 30cm ruffle. I used approximately 4-5m of stiff black tafeta. The waistband is - gasp! How historically unfeasable!- a simple elastic band!