Why might the author have chosen the title of The Boy in the Striped Pajamas?

One of
the main topics of this novel is Bruno's relationship with his new friend Shmuel, who happens to
be a Jewish prisoner at Auschwitz. Since Bruno is young and naive, he does not realize that the
striped pajamas that Shmuel wears are actually an Auschwitz prison uniform. The striped pajamas
differentiate the Jewish prisoners from their Nazi guards and signify their oppression. The fact
that Bruno refers to them as striped pajamas highlights his innocence, which plays a significant
role in the novel and impacts how the story is told. Towards the end of the novel, Shmuel asks
Bruno to help him find his father. In order for Bruno to search for Shmuel's father on the other
side of the fence without being caught, he is forced to wear the Auschwitz prison uniform.
Unfortunately, Bruno is mistaken for a Jewish prisoner and dies alongside his friend in a gas
chamber while wearing the "striped pajamas."