A clothing cutout that exposes a character's chest, breasts, pectorals or cleavage. A cutout is a hole or opening that closes at both the upper and lower edges, in the same layer of clothing. Note that having a cleavage cutout doesn't necessarily mean the character has cleavage to begin with.
The following tags are aliased to this tag: boob_window, cleavage_window, heart_cleavage_cutout, and tit_window (learn more).
This tag implicates clothing_cutout (learn more).