I would cut out the chest area and add lace matching the sleeves. You could connect the top of the lace with the dress material so that it looks like a choker. If you made the lace in an upside down heart; that would look very pretty and subtly sexy.
Georges Hobeika Spring 2015
Georges Hobeika Spring 2015 Haute Couture blooms with fresh shades on which fine embroideries and appliques embellish crepe and silk chiffon