From the link, the white pants are part of the "Drillich" work uniform. From searching around, these were intended as work uniforms / overalls. You were intended to wear these (there were both pants and jackets) over your actual uniform, and these would take the abuse.

It seems like the early war patterns were simply undyed. Mid-war versions were apparently dyed darker.

Here's a forum with a bunch of pictures of examples: https://www.militariacollectors.network/forums/topic/4042-th...

Post WW II the Panzer IV's were offloaded to the Middle East. But it competed well with its Soviet T-34.

At first it looked like Czech military fatigue but the confluence of two rivers points to Germany.

> The man is an unnamed German pioneer likely at the time of recovery.

Undyed coveralls makes sense, thanks.