1800 ca. Chemisette, English. In Jane Austen’s times, there were several ways for women to keep their modesty when the fashion trend was for low cut bodices and loose flowing dresses e.g. Chemisette, Fichu, Pelerine etc.
Chemisette: Sleeveless under-bodice covering neck, shoulders and breast, usually of muslin or lace and worn to fill in the neckline of a dress. French term for vestee, gilet, etc. via Killerton House, U.K. & National Trust.