They are made from duchess silk satin, two layers of coarse linen and a separate linen lining. They are boned with spring steel and the the busk is made of wood. The sewing was made with linen thread. The main reason I eventually wanted to make a new pair was that the bust is too tight and the steel boning makes it too stiff. Also the stitching isn't neat enough for my taste.
Here you can also see the bumroll that I made at the same time. I also made a new shift with narrower sleeves although they are still quite full.