"Clothes make the man. Naked people have little or no effect on society."- Mark Twain. Everyone knows the 3 basic layers of clothing,right? We have an evaporative layer next to the skin to move perspiration off our body and avoid overheating and chilling. Next is insulation, materials that trap warm air. Finally we have a barrier layer to prevent rain and/or wind from further chilling and to keep that warm air and optional moisture in. All garments and shelter assemblies can be categorised into these three layers.