Luckily I never had to invoke the rules. My daughter, 27 now, was the youngest. All three were in HS together and her two older brothers were her protectors. The poor girl had no real boy friends in HS -- everyone was afraid of her brothers. She had what I thought was an attractive dress for the prom and when my sons saw it they said: "OH NO!! Tou aren't wearing that outside of the house." I actually had to intervene.
She is now engaged to a zoomie, of all things.