By this picture. Zombie Characters are done in a way that they have certain uniform and head added later. Why not use that model in multiplayer with Multiplayer Heads? : r/WWII
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WWII Jodhpur Uniform – AbracadabraNYC
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Zombie Soldier | Character costumes, Halloween costumes, Halloween 2019
German WWII Zombies
Call of Duty Nazi Zombie Cosplay Revamped 4 by The-Katherinator on DeviantArt