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40 Best Sister Costume Ideas For Halloween
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Sister Halloween Costumes: Hallie Parker and Annie James From "The Parent Trap"

  • What to wear: Either camp outfits for both of you, or a pretty dress for Annie and some khakis and a t-shirt for Hallie.
  • How to act: If you're Annie, you're overly polite and slightly stuck up. If you're Hallie, you're all about having fun and playing pranks.
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