What color is the dress?

(image from Habr)
Technically, the dress is gray-yellow. This is the closest to white-yellow. If it appears that color in the picture due to lighting and color rendering, and its actual color is different, then that's not our problem: it's the same as changing the color of the dress in Photoshop and then asking people what color it should actually be. In other words, in this case, the question is incorrect; depending on the lighting and the camera's color correction, the dress can be any color. But in the picture, it's gray-yellow, almost white-yellow (or blue-yellow, as an option), and that's it; the rest doesn't matter.