This picture was taken as I woke up and hadn't yet put on all of my clothes so it gives a good view of the shift and the stays.
All the above pictures by Quill
The stays were just two pieces of leather that had lacing holes in both center front and center back edges.
The petticoat was made of two panels that consisted of two layers of unbleached linen stuffed with a thick layer of unprocessed wool, still greasy and all. It was hand quilted, but with rather long stitches.
In this picture the quilting is finished in one direction. The hem is on the right, the top edge at the left.