Is Animal Skin Impure? Is It Necessary To Tan To Make It Pure?
From materialistic point of view, skin can be impure becuase it has fats on internal layer and impurity on outside. Wearing it without proper cleaning may causedermal adsorption. I can understand why it would have been advised to tan the skin first. Perhaps @Irfan76 sb or @UmerQureshi sb can give a better explanation