The golden age of the costume hoodie seems to be drawing toward its inevitable decline as one manufacturer embraces what may very well be the future of more-casual-than-but-also-maybe-more-intense-than-cosplay superhero fashion: Costume backpacks. Leading the way in this potential timeline are Batman and Wonder Woman ’packs manufactured by BioWorld Merchandising, known for producing novelty apparel like belt buckles, t-shirts and the aforementioned costume hoodies based on scads of major pop culture properties.