Every election year, the cliche that somebody should or should not begin measuring the White House drapes gets trotted out. But eight months in to their new life at 1600 Pennsylvania Ave., it looks like the Obamas may finally have brought in some help for the job, in the form of fashion personality and Barney’s New York creative director/window dresser extraordinaire Simon Doonan. You may recognize Doonan from his appearances on America’s Next Top…