This body-contouring square-neck long prom gown is a PromGirl Exclusive. A curve-hugging find for prom, galas, and other formal events, this drop-waist prom gown has  a sheer square-neck corset that wraps around to the back. The long satin formal dress has a long skirt with tummy-camouflaging draped satin fabric that flatters the figure to elevate your evening look. Step into a world of couture elegance when you choose this square-neck long prom dress that is surprisingly under $200.