BCBGeneration Metallic Maxi Dress low back

Sold out everywhere!! Beautiful dress, only worn once for prom. Size is XXS in BCBGeneration (I put it up as S so it wouldn't get lost in search results) but I normally wear US women's size 4-6 or S/M and it fits perfectly. Color is like the first picture (couldn't find many good pictures in the silver color.) open to offers!