Birds of a Feather

Samantha welcomed Kristen into the Flock (as they called themselves)-- a bizarre clique of girls who broadcast their affiliation with the group by always wearing tops decorated with birds.  Swans, chickens, geese, parrots-- even Tweety or Big Bird would do in a pinch.  The specific type of bird didn't matter; it was only essential that a feathered creature of some description be worn at all times.  Failure to comply with this rule was punished with immediate and irrevocable expulsion from the Flock.