The discussed phrase refers to a child’s dress-up outfit inspired by the character James P. “Sulley” Sullivan from the Disney Pixar film “Monsters, Inc.,” specifically designed for toddlers to wear during the Halloween holiday. An example would be a furry blue and purple jumpsuit with attached horns and a tail, sized to fit a small child.
Such attire provides children with an opportunity for imaginative play and creative expression during a widely celebrated festive occasion. The character’s popularity lends itself to easy recognition and can foster a sense of belonging and shared enjoyment among peers. Historically, dressing up in costumes for Halloween has evolved from ancient traditions aimed at warding off spirits to a modern celebration of fantasy and lighthearted fun.