Greetings,
I have been searching for the origin of KG3 for some time and believe it may have originated as far back as WWI and was based on colour of the British Army Uniform. My reasoning for this is the history and articles on the excellent web-page on "Blanco":
http://www.blancoandbull.com/
If you read from the beginning, the colour was originally "Blanco No. 53":
http://www.blancoandbull.com/blanco-history/no-53/
which was then picked up again for WWII as KG3:
http://www.blancoandbull.com/blanco-history/kg3/
This colour is more of a brown shade that Khaki Green J. It can be seen in colour film at IWM and was used on vehicles and equipment (helmets etc) universally (as shown below).
Cheers,
Mark
http://zoom.iwm.org.uk/view/20346&ca...ject-205123850
http://media.iwm.org.uk/iwm/mediaLib...at=photographs
http://media.iwm.org.uk/iwm/mediaLib...at=photographs
http://media.iwm.org.uk/iwm/mediaLib...at=photographs