Mike, I think there was an explanation from someone when I posted a pair of 7th Armoured Division patches a year or so back. I'll try and see if I can find it. I think it had something to do with being made in NW Europe in the latter part of the war, but I'm not sure of the actual textile technicalities i.e. warp, weft, bias weave etc. Otherwise there must be something in Wikipedia.
David
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