Ralph Lauren is sueded inside. Not lined, the single layer of calf leather is perfect suede reverse ~~ the most expensive kind. Others need a thin lining to cover a rough underside. An inexpensive lambskin, microfiber faux suede (moleskin) or cowhide skiver ( the middle shaved between suede and topgrain sides of hide, aka scrap) is what we might get when we buy 'suede-lined" bags. Surprisingly, lambskin bags are popular for their softness, and could go without lining if the skins are nicely prepared, but lining is added to give it more body. Single layer bags may sometimes lack interior features but we all use mini-pouches inside as modules, anyway. Honest leather can show her backside proudly.