I don't want to start an argument. But does piept refer to chest and breast?
"Piept" only means chest. The word for breast is "sân" (scientific version).
When guys talk to one another about a girl, however, they can say "(Ea) are un piept generos.", which would mean that the girl has large...mammaries.
Expr. (Pop.) A avea piept = (despre femeile cu copii mici) a avea lapte. A da piept = (despre femeile cu copii mici) a alăpta, a da să sugă.