It took me shading one of my marks to notice how it kinda looked like my old slaughterhouse apron only shorter and cut in half lengthwise because with our Marks covering our left hip/flank it would make sense as we shotgun one two punched our way through and we seem to stand left leg forward so an apron would cut out mobility and a mark made of heavy Kevlar/Plasteel would make a great gore plow.
(FYI for nine years I wore a bright yellow rubberized apron as I helped turn pigs into bacon and it reminds me of home in a horrible nightmare way)
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I thought it was a crotch protector, like a baseball cup.