Cut up a satin black coat to come up with a similarly structured dress, with this design in mind. Ended up with something different---fingers crossed the coat hadn't died in vain, and that the dress turns out wearable!
Please check your designers; this is not a Chanel gown. Christophe Josse is an Official Member of the Chambre Syndicale de la Haute Couture in Paris. This exquisite gown is from his Haute Couture S/S 2012 Collection.