NWT Pottery Barn Kids Glow in the Dark Spider Witch Halloween Costume 4-6T Only tried on never worn They’ll cast a spell this Halloween with our enchanting twist on a costume classic. It’s designed with a cool web pattern on the dress that glows when the lights go out, and 3-D spiders crawl up the cape for a truly bewitching touch. This stunning costume is designed by our talented Pottery Barn Kids team who personally make the first sample and plan every special detail. Our costume is finished in garment-quality stitching and construction so it can be handed down to siblings and worn for years to come. Made of 100% polyester organza and tulle fabrics. Glow-in-the-dark material needs to “charge” under bright light for approximately half an hour to glow properly. Glow lasts for approximately three to four hours.