shelf bra
A bra that provides at best minimal support under the breasts, leaving the upper part and nipples exposed. As the name suggests, it is essentially a "shelf" to hold up the breasts.
The term "shelf bra" may also refer to "built-in bras" included in some garments, such as tank tops and swimsuits. This tag is only for actual bras, not for the breast support built into garments.
Not to be confused with a regular bra that has been pulled down.
Examples
See also
This tag implicates bra (learn more).

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