Summers of the Sisterhood
The Sisterhoog of the Travelling Pants

Four best friends, one pair of jeans and a few important rules : You must never wash the Pants. You must pass the Pants along to your Sisters according to the specifications set down by the Sisterhood. You must not wear the Pants with a tucked-in shirt and belt. You must write to your Sisters throughout the summer, no matter how much fun you are having without them.