gold and white or black and blue dress
The dress "The dress" is a photograph that became a viral Internet meme on 26 February 2015, when viewers disagreed over whether the colours of the item of clothing depicted were black and blue or white and gold. The phenomenon revealed differences in human colour perception which have been the subject of ongoing scientific investigation in neuroscience and vision science, with a number of papers published in peer-reviewed science journals.
White tie From the 1920s onward black tie slowly replaced white tie as the default evening wear for important events, so that by the 21st century white tie had become rare. White tie nowadays tends to be reserved for special ceremonies—especially state dinners—and a very select group of social events such as the Al Smith Memorial Dinner in New York, the Commemoration balls at Oxford University, certain May Balls at Cambridge University, the June ball at Durham University, the Christmas ball at Buckingham Palace, dinners of certain American hereditary societies, and very formal weddings. The Vienna Opera Ball and the Nobel Prize ceremony are white tie events, and some European universities retain it as the dress code for doctoral conferment ceremonies.