Hi Det, nice work on the Sonderbekleidung for the Army's (Heer) Grossdeutschland Panzer uniform.
Just some points for you with your testing uniform on the first and second skins, if you want to take them on board your choice or not.
On the first skin and I understand that is a generic Enlisted rank's Sonderbekleidung;
Don't forget to add the Totenkopf inside of the collar patches and the National emblem on the right breast. Please remove the Doubled pronged belt as this was used by Army Officers only and replace it with the standard Enlisted ranks buckle.
On the second skin:
By placing a pip on the shoulder strap, you've indicated that the the wearer is of an NCO rank (Feldwebel), however you would also need to place silver Tresse on the shoulder straps edging all the way around. As is, is a miss match and doesn't conform to known archives. The Chain stitched GD cipher on the shoulder strap was used by the Enlisted ranks and was not normally used by NCO ranks, which used a pinned metal GD insignia. Don't forget to add the cuff title 'Grossdeutschland' on the right lower arm and please remove the Doubled pronged belt as this was used by Army Officers only, same as above.
By the time frame given (shown by the wearing of the Crimea badge) generally all these Chain stitched / pinned metal GD cipher were to be removed under 'Allgemeine Heeresmitteilung 1940, Nr.159 of 24 Jan 1940', (for all field uniforms including the Sonderbekleidung) but often or not these General / Standing orders were ignored in some cases.
However these Test skins are well done.