Atria Long Formal Dress 7048h Giant Robot Color by Number coloring page Download, Print or Color. This stunning long halter prom dress, style 7048H from Atria Couture, exudes modern glamour. The empire waist and horizontal bands on the open back create a sleek and elongated silhouette, perfect for prom, galas, and other formal events. Available in misses and some plus sizes, this formal gown features halter straps that tie at the back of the neck and a side slit in the long skirt for a touch of sexiness. A draped back adds a charming train to complete the look. Made in the USA, this strappy back long halter prom dress will make you look and feel like a true belle of the ball.