Camisole
From Wikipedia:
A camisole or cami is a woman's undergarment which covers the top part of the body. It is sleeveless and tight fitting in contrast to a loose-fitting chemise. A camisole is sometimes worn cropped allowing midriff exposure, but often covers the entire torso. Camisoles are manufactured from satin or silk, or stretch materials such as lycra, nylon, or spandex, though cotton based materials are more common.

A camisole can be worn over a brassiere or without one. Some camisoles come with a built-in underwire bra which eliminates the need for a bra among those who prefer one. Recently, camisoles have been known to be used as outerwear.[1]