Princess Louise Augusta
Lady Elizabeth Foster
And now here's my version. I used the Wingeo pattern, which I admit I didn't love. There were actual pieces missing from the pattern and the sleeve wasn't right (wayyyyyyy too big) :( Thanks to Koshka's advice, I got it finished.
And here I am with Koshka, without whom this gown would not exist.
And here are the undergarments to go with:
Chemise and short stays (though I should wear regular, long stays with this)
Then the cotton petticoat
I also made a small bum pad to keep the back of the dress from collapsing above my rear