“Do you know what a hat is? I bet you think you know what a hat is,” notes the unseen narrator at the start of this ode to the chapeau. “Hats are everywhere you look!” An inventory of familiar hats and headwear as well as unusual and inventive definitions for hats parades across the pages, illustrated with delightful digital art and paper collage. Haberdashery hats are one thing, but what about towel turbans and flower crowns? And hats are not just for heads—consider acorn caps on fingertips or the lid of a pot or roof on a house. Hat possibilities are endless as enthusiastically conveyed in this picture book that invites readers to try a few on! (Ages 4-7)