In the 2010 movie True Grit, Mattie Ross (played by Hailee Steinfeld) is a headstrong young 14-year-old girl who enlists the help of U.S. Marshal and bounty hunger Reuben J. "Rooster" Cogburn to bring the man who killed her father to justice.  Cogburn initially tells Mattie to return home but she insists on accompanying him on his quest to track down Tom Chaney, and she eventually proves herself a capable ally.  Mattie wears her father's coat and hat, which are clearly too large for her, over her Victorian period clothing.  You can find a replica bodice jacket online, but if the cost is too high, you can also use a modern blazer with a similar silhouette.

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