Finally I was able to photograph two different chest pieces side by side to show the difference between them. As you can see the difference is subtle. The new one on the left is more narrow than the old one on the right and gives the doll a more slender appearence. The new one also has rounder, slightly fuller breasts than the old one and has narrower shoulders with more 'armpit' space for the stand. So, the two main advantages of the new chest piece are: one, clothes fit it better, especially if they are beaded because on such a small scale beads add more visual thickness to the body, and two, more space for the stand underneath the arms and increased articulation of the shoulder joint. I like it better because it makes the doll look more dainty and delicate.