Hi Jody,
Sorry if I sounded a bit curt, I was in a bit of a hurry when I posted...
The greatcoats were issued in feldgrau. IIRC there were about 3 or 4 versions through the war, and the colour changed as the material, economy, supplies, etc. did - as did the entire German uniform.
I'm not sure what medium you're painting in, but if you, like I do, use acrylics, Colorado Miniatures has a nice Vallejo reference chart. Check out the German grey mixes here:
http://www.coloradominiatures.com/index.asp?PageAction=Custom&ID=5#fieldgrey1I hope that helps, and I'd love to follow your progress. Don't be shy to share it over on Historicus Forma
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Keep well, my friend
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Rudi