This is a Simona Corsellini long slip dress.
Balmain
Elisabetta Dori
Marchesa
Simona Corsellini
Metro Fashion
Solace London
Purple
The Andamane
Aroka
Nenette
431-88
Retrofete
Chinamine
Leset
Shivan & Narresh
Rimzim Dadu
Cult Gaia
Costarellos
Iris Serban