The association between Regina and pink is most famously defined by the decree: .

: This rule is one of several enforced by Regina to maintain exclusivity and control over her clique, "The Plastics". Failure to comply—such as wearing sweatpants on a Monday or missing the pink dress code—results in social banishment from their lunch table.

: Costume designers intentionally utilized more saturated and vibrant pinks for Regina compared to the other girls. This ensured she remained the visual center of every frame, reinforcing her status as the "apex predator" of the high school hierarchy.