So I had to use what ribbon I could find. So the Back is red and the front is only temporarily in green. If I used the pattern again I would either raise the front or lower the armholes and add a little to the side seams.
It sits about midbust. So the front edge is just on the bust point. Which I know is right for regency stays but not sure about 18th century.
I'm working on a 18th century shortgown and was trying it on over my stays so you can see the shape I get with them (note: I am also wearing a bumroll.)