Ya, good catch, you may be right about the tankette crews, (did they wear jumpsuits exclusively all the time?) but give the Italians more credit for fashion sense!

Other references, including the box art and painting guide, seem to indicate that the indigo was definitely the colour of the 'jumpsuit' style overalls, with other combinations including everything from khaki to leather, to the original grey blue of the Italian Esercito Regio and black of the facist 'Black Shirts' ( who were less than useful infantry only I believe)

One of the interesting parts in working on North Africa and the southern Med, is that the combatants seemed less concerned than us about wearing the appropriate uniform, it not being unusual to see Italian and German fellas in Bombay bloomers, or others donning a great coat if you found one, for the cold desert nights.

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Or, maybe those two seated figures were the only two I could fit into the tankette! 

Cheers!