The Hueys in The new sweater / Jeffers, Oliver

One Huey looks different from the other identical Hueys when he wears his new sweater, but before long all the other Hueys decide they want to look different, too.

The small and mischievous creatures known as the Hueys all look and behave in the exact same way, and when one decides it wants to be different and knits a sweater, the others decide they want to be different and knit sweaters that look exactly the same.