Why does anybody care about this photo? Beats me, but it seems to be a simple enough problem to solve. We take our trusty photo editing software, and get clear answers. There may have been some trickery because the lighting and color balance may have been tampered with merely to foster debate. The tldr answer to the question on the color of the dress is "light blueish" and "brownish". Maybe the dress was supposed to be white and gold, but the lighting and other factors could have thrown the image off.