German Tanker Uniforms- Kursk

Black would be the safe way to go but to quote from a book, "By summer of 1943 a special one-piece camouflage overall was in widespread use by tank and gun crews, in the standard SS spotted camouflage scheme. This had a small falling collar, two patch pockets on the chest with straight flaps and metal buttons, and two slash pockets conventially placed in the 'trousers' ; it fastened centrally from throat to crotch with five metal buttons."

Plane Tree no.1/2 or Oak Leaf A, (both in summer green side out) tanker's coveralls in both one and two-piece suits, show up in numerous Das Reich photos at Kursk. Panzer tunics of either Oak Leaf or Blurred edge pattern can also be found in addition to regular black or reed-green, herringbone twill tunics and mouse-gray wool shirts.
Here is the Oak Leaf A, 1-piece coverall;

Thanks jgeratic for the quote and thanks Peridexion for the pic. I grabbed it for later use.