Two turtle friends find a hat in the final book of Jon Klassen's hat trilogy, We Found a Hat. They take turns wearing the hat, and though the hat looks great on each turtle, they decide to leave the hat alone since there aren't two hats.
At least that's the plan.
All of the "Hat" books are full of twists, turns and jaw-dropping moments. Make sure to read all three in the series!
This is Not My Hat
I Want My Hat Back