The phrase refers to attire inspired by characters and elements from the animated miniseries Over the Garden Wall, intended for wear during the Halloween holiday. These ensembles allow individuals to embody figures such as Wirt, Greg, Beatrice, and the Beast through clothing, accessories, and makeup designed to emulate their distinct appearances in the show. As an example, a popular choice would be a Wirt costume featuring a pointed red hat and a dark blue cloak.
The appeal lies in the show’s evocative autumnal aesthetic and its nostalgic themes, which resonate with many viewers. These outfits provide an avenue for expressing appreciation for the series while participating in the tradition of Halloween costuming. Historically, such themed attire gains popularity based on the cultural impact and enduring relevance of the source material.