heyas; this is an interesting question. the breasts were moved to the collars to make their mesh a parent of the shoulders, and thus the pectoral movement could be achieved (theoretically) by moving the shoulders. (the collar, of course, was introduced to allow people to shrug.) the breasts-in-the-collars deal works a lot better than the buttocks-out-of-the-hip deal, but it is still an open question whether it is better than having them in the chest. i'd advise against separate body parts. if the breasts were children of the chest, then neither the collars NOR the shoulders could affect them. you'd end up with a pretty huge, obvious dead zone there on the front of the chest. what would be better would be to leave the breasts on the collars/chest, and give them control handles to pose them. the control handles would be children of the collars/chest, and able to affect the breast mesh area, while leaving that mesh area still affectable by the arms. for morphing, it is better to have the breasts in the chest. for joints, it is probably better not to. oh heck, just stick a big boob on where her head would be. or, why not just skip the entire rest of the body altogether and just have one giant posable boob? now that would make some people very happy.