I'm working on the same problem. I think what I will try (and this may or may not work for you) is put a hinge in the top part that goes over my shoulders from the back to the chest, and then put magnets and a strap clip on the inside of the lower chest piece to join it to the back. Basically a clam shell setup, where I open the chest and back, lower it over the abs, then magnetically and clip it together. I'm probably a month or so away from working on my chest piece, but I'll let you know what happens when I try it out.