I know this is tongue-in-cheek, but it got me to thinking how many people shot I've seen who were shirtless. Given how many urban yoots remove their shirt to fight, junkies stripping off their clothes due to internal overheating, etc. it's actually a reasonably routine occurrence.
Sorta around sometimes for some of your shitty mod needs.
Again, the point of the gelatin is not to be 100% analogous to a living thing, it is meant to be a consistent method of measuring penetration.
You cannot model a living body replete with different tissues, bone, and everything else, and expect to have repeatable, comparable results.
These are two different things you are trying to do, and you need a different medium for each purpose.