I may have Matthew coming after me with a tesla coil for saying this, but not having the chest strap really doesn't bug me.
I can completely understand why Leadslinger didn't draw it–it doesn't really add much, and makes the picture that much harder to draw. I know the counterarguments:
“But it's really there in the movies!” and
“The even managed to draw it in the cartoon!”.
As Leadslinger says, the more complicated the design, the longer it will take to render the characters. He's already got the frightfully complicated proton packs to draw over and over again, so I think he can be cut some slack. (As an occassional artist myself, I don't draw the durn things either
)