quick color question?

The hat mentioned is an M1943 cap I believe , nearly always black for panzermen, field grey for stug/ jagd guys( mistake in band of bros  I saw yesterday with a stug crew ) .    But who is to say  one didn't get tossed into a stug or vice versa , I am sure it happened especially at wars end .   Some of these caps were various camo colors as well .

Depends on the period.  Late war, anything goes.  Otherwise it would seem black black black.

I almost added that, but I know that black was the traditional tanker uniform, regardless of branch, save for perhaps the Luftwaffe panzer units (I'd have to check my references there).

I want to say SS tankers always wore black hats.  I can't say for sure but if no one else says anything then at least someone else is thinking black.

Nearly always black, being a tanker. Wouldn't be unheard of, I suppose, for them to have donned the field gray variant occassionally, but you can't go wrong painting it black.