The phrase signifies ensembles intended for celebratory dress-up, specifically referencing two iconic characters recognized for their whimsical appearance and connection to childhood nostalgia, and contextualized by the autumnal, festive observance. These outfits typically feature elements that visually emulate the distinct characteristics of the aforementioned fictional entities.
The appeal stems from the inherent charm associated with the characters, evoking a sense of innocence and playfulness. Their visual distinctiveness renders the resulting apparel readily identifiable and often elicits positive emotional responses. Further, the concept offers a flexible canvas for creativity, allowing for interpretations ranging from meticulously accurate recreations to more abstract or personalized variations. The historical context of the associated fictional works adds depth and cultural resonance.