chemisette
/ˌʃɛmɪˈzɛt/
noun
- A woman's lightweight undergarment or blouse-like insert worn at the neckline of a dress or jacket, often made of lace or fine fabric.
- She wore a delicate lace chemisette under her wool jacket to add a touch of elegance.
- The vintage dress pattern included a detachable chemisette that could be washed separately.
- In the 19th century, a chemisette was a common accessory to fill in a low neckline.