The ingenious bib front and back construction of the petticoat means it will fit for ages - probably until it wears out. All I really need to do is sew some ties underneath to control the length.
Anyhow, here are photos of the completed petticoat showing with and without the under support of the paniers I made which as you may recall, my niece was less than thrilled about. That's ok, I won't make her wear them but I wanted to show you, because as you can see they really do create the right silhouette for the era.
And below you can see some of the making details. I sandwiched two layers, the silky outer is backed with cotton.