The movie is based on the young adult book, The Sisterhood of the Traveling Pants, by Anne Brashares. As four best friends spend their first summer apart from one another, they share a magical pair of jeans. Despite being of various shapes and sizes, each one of them fits perfectly into the pants. To keep in touch they pass these pants to each other as well as the adventures they are going through while apart.
Four best girlfriends hatch a plan to stay connected with one another as their lives start off in different directions: they pass around a pair of secondhand jeans that fits each of their bodies perfectly.
