thermoregulatory models of clothing development. History of clothing Clothing reveals much about human history. According to Professor Kiki Smith of Smith College, garments preserved in collections are resources for study similar to books and paintings. Scholars around the world have studied a wide range of clothing topics, including the history of specific items of clothing, clothing styles in different cultural groups, and the business of clothing and fashion. The textile curator Linda Baumgarten writes that "clothing provides a remarkable picture of the daily lives, beliefs, expectations, and hopes of those who lived in the past. Clothing presents a number of challenges to historians. Clothing made of textiles or skins is subject to decay, and the erosion of physical integrity may be seen as a loss of cultural information. Costume collections often focus on important pieces of clothing considered unique or otherwise significant, limiting the opportunities scholars have to study everyday clothing. Cultural aspects Gender differentiation In most cultures, gender differentiation of clothing is considered appropriate. The differences are in styles, colors, fabrics, and types. In contemporary Western societies, skirts, dresses, and high-heeled shoes are usually seen as women's clothing, while neckties usually are seen as men's clothing. Trousers were once seen as exclusively men's clothing, but nowadays are worn by both genders. Men's clothes are often more practical (that is, they can function well under a wide variety of situations), but a wider range of clothing styles is available for women. Typically, men are allowed to bare their chests in a greater variety of public places. It is generally common for a woman to wear clothing perceived as masculine, while the opposite is seen as unusual. Contemporary men may sometimes choose to wear men's skirts such as togas or kilts in particular cultures, especially on ceremonial occasions. In previous times, such garments often were worn as normal daily clothing by men. In some cultures, sumptuary laws regulate what men and women are required to wear. Islam requires women to wear certain forms of attire, usually hijab. What items required varies in different Muslim societies; however, women are usually required to cover more of their bodies than men. Articles of clothing Muslim women wear under these laws or traditions range from the head-scarf to the burqa. Some contemporary clothing styles designed to be worn by either gender, such as T-shirts, have started out as menswear, but some articles, such as the