When a top is short enough, or strategically cut, to show the undersides of a woman's breasts, it is known as Underboobs. This is the standard outfit for women in loose-fitting armor in pulp fantasy. It is possibly the most impractical outfit for fighting in ever, particularly when the top is loose-fitting (unless the character is some sort of exhibitionist).

This sort of outfit always implies Vapor Wear, and is always accompanied by a Bare Midriff.

Compare Absolute Cleavage and Impossibly Low Neckline.