Blouse
From wipipedia.org
A blouse is a loose garment, usually of lightweight material, worn by women. It covers the upper body. It will normally have buttons down the front and a collar. It may be sleeveless, or have short or long sleeves.
Blouses may be made of fetish materials such as latex or satin. If the blouse is shaped and is not too loose, it outlines the breasts clearly. It may be possible to see the wearer's bra through the blouse, or to glimpse the breasts or bra through the arm holes of a sleeveless blouse or between two buttons where the material gapes.
