How to dress
The dress is to be put on by the head. Then you can easily adjust with ties, both at the waist and at the neckline.
To give this historical gown its full and gorgeous volume, it is better to wear it over a quilted petticoat or bum pad, just like this one:
In the presentation photos, the gown is worn over a bum pad which adds volume to the hips and emphases the thinness of the waist.
A bum pad is available in the shop, here: https://atelier-serraspina.com/products/suzie-18th-century-bum-pad.