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Wooden - some truth in that Re these singlets
The shearers singlets almost turned to wood after a while as the hair (not wool) from the sheeps hooks would impregnate into the siglet and not wash out...

Better still - shearers quarters midnight cloths lines :-))

Thought Farmalnds still had them they are the "MKM" Original Brand
I use the lighter wollen MKM now - but I think last time I looked there they had the heavy ones too