Definitions by Bruce Banner's girl

Plaid Shirt Rule

The phenomenon wherein a cute boy wears a plaid shirt, and suddenly becomes 100% more attractive to all heterosexual females and homosexual males in the vicinity.

Jane: Whoa, did John get hotter?
Joseph: Nah, he's just following the plaid shirt rule.

Plaid Shirt Rule by Bruce Banner's girl February 4, 2013