This character wears a open cup bra.

While the primary purpose of a bras is to enhance the wearer's comfort by supporting her breasts, open cup bras have also the purpose of enhance the wearer's sexyness. In fact open cup bras look sexier than traditional bras and they are usually worn in conjuction with other sexy lingerie to the purpose of having sex or modeling.

Note: Do not use this trait with a normal transparent bra. This trait is about the shape of the bra and not about visible tits.

NSWF Open Cup Bra
NSWF Half Bra
NSWF Open Cup Bustier