This dress comes with 2 pieces - all pictured in the photos.
Dress: Maggie Sottero, Mermaid style with laser cut leather train, full buttons in back
Overskirt: 18534-EVE 2017 Collection Overskirt.
Note on the Street Size - 8 is my guess. I typically wear a 6-8 pant/short depending on the brand and a size medium shirt.