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''The Sisterhood of the Traveling Pants'' is a series of books by Ann Brashares. The series chronicles the lives of four girls who have been best friends since they were babies. One summer before they had to split for the season, they find a pair of jeans that magically fit all four of them. So they decide to rotate the pants around through the mail to keep in touch while they're apart. Each book in the series takes place over one summer.

In 2005 a movie was made based on the first book. It starred Creator/AmberTamblyn, Creator/AmericaFerrera, Creator/BlakeLively, and Creator/AlexisBledel. The original series consisted of four books, but a sequel has been released since then, as well as a spin-off taking place in the same universe and focusing on new characters.

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!!This book series and film adaptation provide examples of:

* AdaptationalCurves: Tibby in the books is said to be petite and flat-chested like a younger child, the movies has her portrayed by the slightly shapelier Amber Tamblyn.
* AesopAmnesia: Very weirdly averted. At first, Carmen getting mad at her mother for [[spoiler: getting pregnant]] might seem like she's forgetting her experiences in the first and second book, but her inner narrative states that she can figure out what happens when she gets angry and the fallout, but she still does it.
** [[spoiler:Played straight for almost everyone]] in Sisterhood Everlasting. [[spoiler:Carmen lets someone she has no real connection with absorb her life, Lena watches life drift by by waiting for Kostos again, and the girls make the same mistake their mothers did by letting each other slip away.]]
* AffectionateNickname: They all have these for each other: Carma, Lenny, Tibs, and Bee.
* AnguishedDeclarationOfLove: Lena gives two of these to Kostos.
* AttractivenessIsolation: Lena.
* TheBabyTrap: In the second book, [[spoiler:a girl that Kostos sleeps with after Lena breaks up with him fakes a pregnancy in order to guilt Kostos into marriage]].
* BeautyBrainsAndBrawn:
** Lena: Beauty
** Tibby: Brains
** Bridget: Brawn
** Carmen: All of the above (curvy figured fashionista, straight A's, and a bold temperament)
* [[BloodBrothers Blood Sisters]]: On the eve of their separation, magic has come to them in a pair of pants that they will share. They are the 'sisters of the pants' that link them in hearts and spirits...
* BookEnds: Carmen narrates the prologue of the first book and the epilogue of ''Sisterhood Everlasting''.
* BreakTheCutie: Lena in the second book.
** Carmen when she's without her friends at college.
* CallingTheOldManOut: Carmen does this to her father in the first book.
* CharacterDevelopment: A lot over the books, Bridget possibly receiving the most.
* ChickLit
* ChildhoodFriendRomance: Bridget and Billy Kline in the second book.
* DeadGuyJunior: In the sequel, there's [[spoiler:Tibby's daughter, Bailey.]]
* DeadpanSnarker: Tibby.
* DidTheyOrDidntThey: It's purposely left ambiguous if [[spoiler:Bridget and Eric]] did in the first book, though in the fourth book [[spoiler:Bridget finally says it actually happened]].
* DisappearedDad: Carmen's father was one before the start of the series.
* DisposableFiance: Kostos has one in the original series and Carmen has one in the sequel. Both [[spoiler:Evil All Along]].
* DrivenToSuicide:
** Implied with Bridget's mother.
** [[spoiler:Subverted with Tibby]] in Sisterhood Everlasting.
* DysfunctionalFamily: Bridget's family.
* {{Epigraph}}: Each chapter begins with one.
* EveryoneLovesBlondes: Wild and unstoppable Bridget. Her hair is her most striking feature, so when [[spoiler:she dyes it]] in the second book, it's clear [[{{HeroicBSOD}} something's up]].
* FalseFriend: Julia to Carmen in the fourth book.
* FamilyBusiness: Lena's grandparents run a Greek restaurant together.
* FourGirlEnsemble: There is Lena, who is a shy, introspective aspiring artist, Bridget, who is daring and courageous with gorgeous blond hair, Carmen, who is the organized one and the "glue" keeping the Sisterhood together, and Tibby, who is known as the rebel and disdainful one.
** FourTemperamentEnsemble:
*** Sanguine: [[GenkiGirl Bridget]].
*** Choleric: [[SpicyLatina Carmen]].
*** Melancholic: [[TheSnarkKnight Tibby]].
*** Phlegmatic: [[ShrinkingViolet Lena]].
* FriendshipMoment: Especially the endings of the books are full of them.
* GrayRainOfDepression: When Carmen's dad moves out.
* GoodGirlsAvoidAbortion: [[spoiler:Played straight with Bridget]] in the sequel.
* HeIsAllGrownUp: Brian by the third book.
* HeroicBSOD: The ''entire year'' between the first and second book serves as one for Bridget.
* HippieParents: How Tibby's parents were before they settled down and had more kids.
* HormoneAddledTeenager: All of the girls at some point.
* IvyLeagueForEveryone: Subverted in the third and fourth books. Bridget went to Brown, but the rest of the girls went to some prestigious schools outside of the ivy league.
* {{Kuudere}}: Tibby (following the [[DeadpanSnarker cynic route]]) and Lena (following the [[DefrostingIceQueen stoic and distant variety]]), both balancing {{Tsundere}} Carmen and GenkiGirl Bridget.
* LittlestCancerPatient: [[spoiler:Bailey]] in the first book.
* LamazeClass: In the third book, Carmen goes with her mom to Lamaze class, but it's [[spoiler:Tibby]] who's there when she gives birth.
* MissingMom: Bridget's mom died sometime before the series begins. It's implied to have been suicide.
* MoodSwinger: Bridget, who is said to be a lot like her mom in this regard. A popular AlternateCharacterInterpretation is that she has bipolar disorder.
* NakedFirstImpression: Lena and Kostos.
* RaisedByGrandparents: Kostos.
* SatelliteLoveInterest: There were a couple in the first series, namely Win and Leo. Eric fell into this trope in the sequel.
* SexChangesEverything:
** Tibby and Brian in the fourth book.
** Bridget with Eric in the first.
* SceneryPorn: Almost every shot in Greece is gorgeous.
* SiblingYinYang: Lena is quiet and withdrawn, while her sister Effie is confident and outgoing.
** Goes for Bee and her twin brother Perry, too. Bee is outgoing, passionate, impulsive and a jock, while Perry is very quiet, withdrawn, and lives at his computer.
* SoBeautifulItsACurse: Lena, though in a more realistic case than usual. Her striking good looks contrast with her antisocial personality, and most people are too intimidated to even approach her.
* SpicyLatina: Carmen's hurt feelings and temper lead her to throw a rock through her father's dining room window and then run away.
* TomboyAndGirlyGirl: Broody, [[DeadpanSnarker snarky]] Tibby comes off as more tomboyish than the other girls, especially [[TheFashionista fashionable]] [[SpicyLatina Carmen]], but the trope isn't really played straight. Sporty, flirtatious Bridget is also the tomboy to [[ShrinkingViolet shy]], artistic Lena.
* TrueCompanions: Carmen narrates saying, "Together, it was as if we formed one single, complete person."
* {{Tsundere}}: Carmen, although she rarely is ''Tsun'' to any of her romantic interests, instead towards her family and occasionally her friends.
* WiseBeyondTheirYears: Bailey.

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