This dress is interesting, because while costumes are often made in duplicates for filming purposes, this one actually shows up on screen on two different people! Both actresses Jo Anderson and Delane Matthews wear a pair of matching dresses with elaborate gold and silver beaded collars for a fashion show in an episode of HBO's brilliant series From the Earth to the Moon.
The gown makes an appearance again later in AMC's equally as fantastic original show Mad Men, on Peyton List as Jane Sterling. The gown appears to be the one worn by Jo Anderson, as it has a seam down the center front. The one on Delane Matthews does not.
The gown on Jo Anderson appears again a third time on Kristen Wiig as Cynthia Morehouse in The Spoils of Babylon.