You gotta be freakin kidding me... good grief.
Something occurs to me here. This method is going to necessarily limit the amount of explosive he can carry, compared to a belt/vest sort of carry. This’ll be a much smaller explosion. Of course it’s going to obliterate his lower torso and internal organs. But I have to wonder if his head might be somewhat shielded and “survive” the initial blast and shock wave and he wouldn’t die instantly. It might take a few minutes for the brain to finally die. It could hurt like the dickens.
Hopefully.