Lily, a cheerful young girl with bright pigtails, watches excitedly as her mother's oversized blue swimsuit goes through the wash and then the dryer. With the help of her magical friends, Pop the Good, Pop from the Park, and Silly Zoom, Lily observes in wonder as the swimsuit appears to shrink before her eyes. To her delight, when the dryer stops, the swimsuit is now the perfect size for her, leading to a joyful moment and the promise of splashing fun.