Those little flak jackets.
I hate 'em. They are clearly not robot chassis, and they are an obvious bid to save money from tooling costs. Not only do they not look like robot torsos, they make all of the Kreons wearing them look like they are in a uniform.
Worse yet, it looks like half of the new Kreons are sporting them.
If Hasbro must do the vest thing, I'd like them to do something like this:
![Image](http://i398.photobucket.com/albums/pp63/tresobyr/prowlvest_zps9ef3ba4f.jpg)
That's my attempt to create a Prowl-esque chest plate. I put together two versions, one with permanent doors and one with removable doors. The sans door version has a peg on the back.