The phrase identifies attire intended for celebratory wear on October 31st, designed to emulate the appearance of characters popularized by Walt Disney Studios. These characters are typically female protagonists from animated feature films. An example would be a long blue gown coupled with a tiara, meant to evoke Cinderella, worn on Halloween night.
This type of garment offers children, and occasionally adults, an opportunity for imaginative play and self-expression. The enduring appeal of these figures provides a familiar and easily recognizable theme for social gatherings. The concept has evolved from simple homemade replicas to mass-produced, commercially available ensembles reflecting the widespread recognition and appreciation of these characters.