Humans have been able to live in every climatic region on earth. Different kinds of body covering or clothing enable people to maintain healthful body regulation by preventing heat loss in cold weather and by precluding dangerous heat buildup in hot weather. Throughout the history of mankind people have fashioned clothing from available materials made from sheep's wool, fish skins, sea mammals, animal furs and hides, plant fibers like cotton or flax, and silk from silkworms. Most often a garment is made from materials indigenous to an area determined by environment and climate. Now synthetic fibers such as nylon and rayon are used as well. But, they too are selected and worn for specific weather expectations.
Weather and climate set both style and material for dress. Porous, lightweight material, worn loose, shorter, and more open, is designed to allow air to reach the skin in order to cool the body by evaporating perspiration. In cold weather it is better to put on layers of clothes since the cold air is kept out, and the warmth of the body is held insulated between the superimposed clothes. Desert living peoples, like Bedouins and other Arabs, dress sensibly for rapidly changing temperatures and sandstorms. Loose flowing robes allow air to circulate and guard the body against the intense heat of the sun during the day and provide warmth for the huge drop in temperature--as much as 90 degrees in a few hours--after nightfall. An ancient problem is keeping one's feet dry. Wet feet are prone to frostbite and disease, common maladies in cold climate regions. Appropriately insulated footwear are worn for prolonged winter conditions.
Traditional wrap-around sarongs, worn around the lower part of the body as a principal garment of the East Indies by men and women, seem to be appropriate for the hot days of that region. The sari, a long piece of cloth worn wrapped around the entire body in the form of a skirt and draped over the shoulder and head by Hindu women of India also serves