A neckline dress refers to the shape or style of the neckline on a dress. It describes how the top part of the dress is designed, such as a V-shaped, round, square, or strapless neckline. Full definition
Her plunging neckline dress with a nude beaded top and lightly pleated lavender skirt also had gold embellished detailing. (redcarpet-fashionawards.com)
High neckline dresses will make your chest look more modest. (layow.com)
I like this wrap neckline dress because it has a little bit of an unusual line but still looks really wearable. (corporettemoms.com)