Marie-Amélie is wearing Balenciaga : her jacket is from the resort 2013 collection and her shoes from the spring summer 2013 runway collection.
credit : Balenciaga
You may find similar dresses with a flared paneled skirt at farfetch :
BALENCIAGA leather dress / BALENCIAGA suede dress
BALENCIAGA 'Tent' dress / BALENCIAGA 'Tent' dress
Then you may find some block heel shoes from the resort collection at mytheresa :
CUBE PATENT LEATHER SANDALS WITH BLOCKY HEEL / CUBE PATENT LEATHER SANDALS WITH BLOCKY HEEL
CUBE BLOCK HEEL LEATHER LOAFERS
Everything is by Balenciaga.