Cordelia Foxx (Sarah Paulson) wore this 100% silk vine print dress in the final episode of American Horror Story: Coven.

It is the Peter Som Vine Print Crepe De Chine Dress.  It was available HERE but it is now sold out.

All outfits from American Horror Story
Other Outfits from AHS : Season 3 Episode 13
Cordelia’s Other Outfits