The dress was black and blue, but the conditions of the photograph caused many to perceive it as white and gold, creating debate. Within a week, more than ten million tweets had Black Metallic Floral Jacquard Mini Dress Event Dresses Red Dress HATCH Collection The Daniella Metallic Knit Mini Dress in Black Copper Size: 0 Optical illusion renews blue and black dress debate nine years on Express.co.uk