For purposes of the large breasts, huge breasts, and gigantic breasts tags, we compare a woman's breasts to her head.
- Large: "If the breasts are of roughly similar volume in comparison to their owner's head, this is the tag to use."
- Huge: "The preferred rule of thumb is that breasts which are larger than the character's head, but less than twice the volume of the head, should be given this tag."
- Gigantic: "Breasts of a tremendous volume, at least twice as big as the girl's head."
I've noticed some inconsistency in the way these tags are used, and I was wondering, are you supposed to compare each breast or both breasts combined to the girl's head? It makes a huge difference in where the thresholds break.
Whichever way this goes down, I propose updating the Wiki pages to make this ambiguity clear.