There are 5 books in the Sisterhood Series series. The newest book is Sisterhood Everlasting which came out in 1998.

1
The Sisterhood of the Traveling Pants

Book cover of The Sisterhood of the Traveling Pants

Carmen, Tibby, Lena and Bridget have been best friends all their lives. They live in the same small American town and usually spend every moment of their long summer holidays together. The year they turn 16 is the first time they have separate plans for the summer but the girls…

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2
The Second Summer of the Sisterhood

Book cover of The Second Summer of the Sisterhood
With a little bit of sand in pockets, the Travelling Pants and the Sisterhood that wears them are back - and ready to embark on their 16th summer . . . Lena's in love - but will it end in a broken heart? Bridget: She's about to face up to…

3
Girls in Pants

Book cover of Girls in Pants
Summer is always a special time for the four teenage best friends: Bee, Tibby, Carmen and Lena. They have the time to hang out, get jobs, share secrets, discuss boys - and wear the amazing jeans they call the travelling pants. This year there's an added poignancy as the girls…

4
Forever in Blue

Book cover of Forever in Blue
With unraveled embroidery and fraying hems, the Traveling Pants are back for one last, glorious summer.

Lena: Immerses herself in her painting and an intoxicating summer fling, fearing that the moment she forgets about Kostos will be the moment she sees him again.

Carmen: Falls under the spell of a…

5
Sisterhood Everlasting

Book cover of Sisterhood Everlasting
Return to the Sisterhood of the Traveling Pants . . . ten years later.
 
From #1 New York Times bestselling author Ann Brashares comes the welcome return of the characters whose friendship became a touchstone for a generation. Now Tibby, Lena, Carmen, and Bridget have grown up, starting their lives…