Have you heard of Vantablack? It's a material so black that it absorbs all but .035% of visible light. I know that seems hard to imagine, so here's a picture of it on crumpled aluminum foil:
Wild. It's made from carbon nanotubes that are really, really small. "Take one of the hairs on your head,” Ben Jensen, the chief technical officer of Surrey NanoSystems, explains to The Guardian. “Split that hair 10,000 times and one of the strands that you take away is the size of the tubes that we grow."
How cool would it be to have a dress made out of it? You would literally see nothing but your silhouette. Right now they're using it for imaging systems in defense and space, which is okay I guess, but c'mon, science. Make the most perfect Little Black Dress for me.