What is the difference between a plunge bra and a normal bra?

The defining feature of a plunge bra is the deep V-shaped neckline created by the low center gore that extends down between the breasts, often to the bottom of the band. This allows the bra to stay hidden under tops and dresses with very low necklines.

A traditional t-shirt bra is meant to disappear underneath your clothing. They feature smooth, molded cups that give breasts a natural, rounded shape.