The pet-en-l'air is a jacket. It has a fitted torso without front waist seam, and a pleated sack back that extends from neckline to hem. Designed to be worn over stays, the Pet-en-l'air was popular from the 1750s to the 1770s.
The pattern includes instructions for converting the pet-en-l'air to a full gown known as the Robe à l'Anglaise.
Made in the USA.