"Moleskin, originally referring to the short, silky fur of a mole, is heavy cotton fabric, woven and then sheared to create a short soft pile on one side. The word is also used for clothing made from this fabric. It is also used in adhesive pads stuck to the feet to prevent blisters."
Which sort of implies it used to be but isn't anymore (I like the alternative meaning offered up there as well).
"There’s an ordinary English word, moleskin, which, as you might guess, originally referred to the skin of a mole. About a century ago, the term was extended to apply to a type of cotton fabric that looked and felt a bit like natural moleskin."
Again, looks like it isn't anymore.