Known as the Diaghilev dress, the floor-length strapless number was indeed fit for a princess thanks to its extravagant gold sequins, crystals and pearl embellishments, reported E! online.
It also featured detachable sleeves and a matching headband.
It is said that Princess Diana fell in love with the gown at Red Cross Benefit back in 1986 when she first time saw it, and rather than having designers create a custom one for her, she snapped up the runway version.