I think this is mostly due to the way V3 is rigged, her collars extend rather far into her chest. All rigging is a compromise; it is going to work better in some poses than in others. I think DAZ was more intrested in getting the up-down right than the front-back. I'm glad they didn't put any extra JCM in for this, matching her up down JCM in clothing is a nightmare already. ;-) Here is GJ in a similar pose, to show a different way of doing it; she is rigged more old-style, with collars that don't extend so far, though I did extend them farther than stock Jessi, though.