NL Sexy prom dresses with low back and high slit The sexy prom dresses with a low back and high slit are available in luxury fabrics and in chiffons and jersey. The high slit is immediately visible at some dresses. While with other models, the slit is only visible during walking or dancing. The sexy dresses often have a low V-neck and beautiful shimmering details. Many of the prom dresses have a low back or keyhole open back.