Because not all boob windows are keyhole_turtlenecks. Keyhole_turtleneck could also imply cleavage_cutout unless there's a reason not to do so.
Updated by AlexYorim
Topic: Alias boob_window -> cleavage_cutout
Posted under Tag Alias and Implication Suggestions
+1
I made the same mistake and I'm sure others have as well.
Updated by anonymous
Why not cleavage_window? TV Tropes call it that.
Updated by anonymous