The dress is an electric blue evening or gala design, with an asymmetrical cut and distinctive details:

Neckline: Features a sweetheart neckline on the front, adorned with rhinestones or shiny sequins on the bust.

Sleeves/Straps: A single wide strap falls on the left shoulder, while the right shoulder is exposed, creating an "off-the-shoulder" effect or asymmetrical bardot neckline in that area.

Cut: The dress is fitted at the top and waist, with a long, flowing skirt that falls to the floor.

Details: Includes a high opening on the left leg, revealing the leg, and an additional fabric panel that falls from the waist on the left side, adding volume and a tail or drag effect.

Material: It seems to be a satin fabric or similar that gives it a shiny and elegant finish.