Fraidyzoo by Thyra Heder

From chapters.ca:
It's a great day to go to the zoo! As her family hustles to get out the door, Little T lags behind. She's afraid to go back to the zoo; the only trouble is, she can't remember why. As an ingenious solution to help her remember, her mom, dad, and sister construct homemade costumes and act out zoo animals - in alphabetical order, no less! The costumes and scenes grow increasingly elaborate and breathtakingly creative. An umbrella and bubble wrap magically transform into a jellyfish, bath towels and a can of soda become a parrot, and many, many more. At the end of the day, Little T has conquered her fear and no longer feels like a "fraidyzoo." In this charming, witty picture book debut, Thyra Heder honors the bravery it takes to face your fears, and the loving people who help you do so.