Hayley Marshall (Phoebe Tonkin) wears this floral shift dress in this episode of The Originals.

It is the Forever 21 Whimsy Floral Shift Dress w/ Sash. Unfortunately it is unavailable

All Outfits from The Originals
Other Outfits from The Originals Season 1 Episode 22
Hayley Marshall’s Other Outfits