The phrase identifies a thematic pairing for celebratory attire: garments that evoke the aesthetic of a heavily armored warrior from the European Middle Ages, intended for wear during the annual Halloween holiday. Such ensembles typically replicate or abstract the appearance of plate armor, chainmail, or other historical defensive wear, often incorporating associated weaponry like swords, shields, or polearms. A child dressed as a crusader or an adult sporting a suit of faux-steel represents instances of this type of costuming.
The appeal of these types of outfits stems from several factors. They provide a visual representation of strength, courage, and historical significance. The Middle Ages, often romanticized in popular culture, offer a rich source of inspiration, with figures like King Arthur, Joan of Arc, and various knights serving as readily recognizable templates. Furthermore, these costumes often allow for creative interpretation and adaptation, ranging from historically accurate recreations to fantastical or humorous variations.