i know mole skin-- but to my mind mole skin (except when sold by Dr Scholls for foot care,) is always a dark color.. a dark olivy green, or khaki colored..
mole skin is a very strong twill with a napped surface --not quite felted, (but surprising pleasant to touch) -- it was common cloth for miners overalls
and is it mole skin because miners and navies and sand hogs were sometimes called moles? or because it looked like moles skin? i don't know!

i don't know durance as cloth at all..