The shaped skirt is mostly a later skirt. It starts showing up a lot on the 1810s. Hunnisett does have a shaped skirt pattern as early as 1800 though, and hers are taken from originals. Earlier though, it's just a mild slope at the sides. They don't really get a lot of shaping until the skirts that you can actually see the back thrust in, for lack of a better term. They're very pretty, I think!