In the case of autobiography, it is also a question of public image. Consider the case of My Turn, The Memoirs of Nancy Reagan. In the American edition, the former first lady appears sans jewelry, wearing an all-American red-checkered blouse, as if she were en route to a church picnic or Walmart. In the English edition, she was able to dress more elegantly, as if she were preparing to meet Lily Safra for luncheon at the Savoy.
One imagines the English version was more to her liking. It is easy, however, to see the logic behind the dressed-down look for the American edition. She spent the previous eight years battling accusations that she was overly obsessed with clothes (see: Nancy Reagan, A First Lady's Style).
The English. We like posh Nancy!