Hi Olivier,
This is a first for me. It may be something the original owner did and not official. The blue cloth appears the same as the patch of blue felt used to produce the SAAF helmet flash, so this may be the source of the backing. The SAAF guys during WWII tended to wear whatever they were comfartable in. My own uncle, a SAAf R/O wore civvy courdroy trousers up north.
Steven
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