As far as Fverbaas' observation goes, it's easy to create a morph for the breasts that emulates a spandex. Sort of like the figure is wearing a clingy tshirt. I've made this on a few occasions, frequently before a retopo when I want to extract a geometry to create a dynamic shirt. I create the spandex between the breasts and completely flatten the navel into the surrounding mesh. This could easily be included in your utility morphs.