I'm using a dress in the Snowshill collection as my inspiration - images and scale patterns are in Costume in Detail and Patterns of Fashion - and its close to my size 12. Jennie Chancey released a 1780s Portrait Dress Pattern that is very similar and only needed minor changes to fit - the only alterations were raising the height of the back to cover my stays. My fabric is Duran silk from Sweden.
More updates soon - I need to make and attach the trim tonight. If you're in Canberra please do come to the ball on Saturday.