Ruby the Copycat by Peggy Rathmann

Cecilia Bard Multicultural Library for Peace.

It's the first day of school, and Ruby is new. When her classmate Angela wears a red bow in her hair, Ruby comes back from lunch wearing a red bow, too. When Angela wears a flowered dress, suddenly Ruby's wearing one, too. Fortunately, Ruby's teacher knows a better way to help Ruby fit in--by showing how much fun it is to be herself.