Lady Harriet's Green Day Dress

This is probably the plainest and least exotic of Lady Harriet's dresses. ;-)

It is a button-front dress with darts on either side of the bodice, with a bateau neckline.

The back:

I think the main part of this dress can be made from Sense and Sensibility's Romantic era dress pattern, but the sleeves seem a little more like Truly Victorian 455 (or perhaps you could alter S&S's sleeves to have the short puffed sleeves with long, slim undersleeves.)