Proudest Blue, The

 It's Faizah's older sister's first day of hijab--a hijab of beautiful blue fabric, like the ocean waving to the sky. But not everyone sees the hijab as beautiful, and in the face of hurtful, confusing words, Faizah will find new ways to be strong.

You might wish to read the author's note at the back of the book and have a way to explain why people wear a hijab, as the book doesn't define it. Here's a link that might help give you a little background.