What is the name of childrens book that has a girl with balloons in her hair and man too small for his armor?

You're likely thinking of the book "The Paper Bag Princess" by Robert Munsch.

Here's why:

* Girl with balloons in her hair: The main character, Elizabeth, has her hair full of balloons after a dragon destroys her castle.

* Man too small for his armor: The prince, who Elizabeth is supposed to marry, is too small for his armor after the dragon burns his clothes.

Let me know if you're thinking of a different book!