From the designer:
This was designed as a hand knit evening gown, but you can make it any length you want. Stop at Corset Length (at the hip), at Mini Length (mid-thigh), at Tea Length (mid-calf) or to the floor - gown length. It’s your choice!
The center front can be worn as knit, or pull it down and gather it to create a deep cleavage look. Convert it as you see fit!

Construction: The dress is knit from the neckline down, sleeve openings are bound off and cast on in the next row. The body is ribbed, the skirt is worked in 6 sections (gores).