I love this bun and it's VERY in right now! I don't use a sock though. I put my hair in a loose high ponytail and twist the hair loosely around. I pull the bun to loosen it a bit and voila! Perfect idea for Dorie's hairstyle!
Anyone with short or medium length hair knows that updos can be a big struggle, if not totally impossible. But leaving your hair down all the time? That gets boring fast. I recently chopped a few inches off of my longish hair for a lob with choppy ends.