Some science fact :
Your brain is actually trying to correct for sunlight, and in the process it's screwing everyone who sees white and gold.
In order to perceive colours, different wavelengths of light have to enter the lenses of our eyes and hit our retinas, and this triggers the nerves that connect to our brain's visual cortex, which results in us seeing a picture.
But importantly, the light your eye receives doesn't just contain the wavelengths of light reflecting off the object you're looking at, but also those wavelengths that are lighting up the world.
Your brain is really smart, and it knows this, so without you having to think about it, it just subtracts these other wavelengths from the 'real' colour of the object you're looking at. Which is where everything is going wrong with that goddamn dress - some of our brains are colour-correcting in different ways.
So people either discount the blue side, in which case they end up seeing white and gold, or discount the gold side, in which case they end up with blue and black.
source : sciencealert. com/here-s-the-science-behind-that-goddamn-dress