Lulus Exclusive! If you've got a special occasion that needs that X-tra boost of style, wear the X Marks the Spot Black Midi Dress! This stylish black dress has a single off-the-shoulder strap that elegantly frames the neck and back as it travels down the seamed bodice to craft a unique X pattern. Below the off-the-shoulder strap, a wide band crosses the open back for the perfect finishing touch to the bodice. Midi-length skirt.