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40 Best Sister Costume Ideas For Halloween
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Sister Halloween Costumes: Lady Mary and Lady Rose From "Downton Abbey"

  • What to wear: Turn-of-the-century gowns. If you have a third to be Lady Sybil, make sure her gown is dirty (you know, like a zombie).
  • How to act: Lady Mary is hauty, while Lady Rose would be talking about her adventures in London.
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