Costume design - morbid touch

As the characters are zombies, consider these options---

1) Have the uniforms button in the back. Given their zombie state, the troops might require humans to dress them for combat. The human handlers would prefer not to look into the face of a zombie trooper during that gruesome task.

2) Sew the uniforms right onto the zombie, without any visible fasteners. As they exist solely for combat, there is little point in making their uniforms removeable.

In fact, the only real purpose of the uniforms would be to easily identify the troops from the rest of the German forces.