It is clearly the ivory dress; the negative and positive of the original image will show nearly the same colors simply swapping places ('gold' stripes become 'w

It is clearly the ivory dress; the negative and positive of the original image will show nearly the same colors simply swapping places ('gold' stripes become 'white' and vice-versa) which is only possible if the two colors are opposite each other. Black and blue are not. Black and near-white are.