On Katy's birthday, all of her animal friends come to the party dressed in clothes of different colors.

As Imagination Soup notes, this picture book is a great choice for preschoolers, since it as clear, repeating text and a story that emergent readers can relate to.

"Based on the song of the same title," Imagination Soup says, "sing about the creatures who go to Katy’s birthday party—and what they wear. Mary where her red dress. Henry wore his green sneakers. Katy wore her yellow sweater. The color and clothing repeat. (Green sneakers, green sneakers, green sneakers.)