why human beings need to wear clothes?

Humans nearly universally wear clothing, which is also known as dress, garments, attire, or apparel. People wear clothing for functional as well as for social reasons. Clothing protects the vulnerable nude human body from the extremes of weather, other features of our environment, and for safety reasons. Every article of clothing also carries a cultural and social meaning. Human beings are the only mammals known to wear clothing, with the exception of
human pets clothed by their owners.


圖片參考：http://images.google.com.hk/images?q=tbn:H65ThbFss1RNEM:http://2.srv.fotopages.com/2/10763641.jpg


People also decorate their bodies with makeup or cosmetics, perfume, and other ornamentation; they also cut, dye, and arrange the hair of their heads, faces, and bodies (see hairstyle), and sometimes also mark their skin (by tattoos, scarifications, and piercings). All these decorations contribute to the overall effect and message of clothing, but do not constitute clothing per se.