Hanbok (South Korea) or Chosŏn-ot (North Korea) is the traditional Korean dress. It is often characterized by vibrant colors and simple lines without pockets. Although the term literally means "Korean clothing", hanbok today often refers specifically to hanbok of Joseon Dynasty and is worn as semi-formal or formal wear during traditional festivals and celebrations. Hanbok starts since Gojoseon(B.C. 2333~B.C. 108). Gojoseon was first nation of Korea. You can find information at http://www.kgc.or.kr/kor/sim/200501/1_our.php and http://uriculture.com/s_menu.html?menu_mcat=100540&menu_cat=100001&img_num= The modern hanbok does not exactly follow the actual style as worn in Joseon dynasty since it went through some major changes during the 20th century for practical reasons.

Throughout history, Korea had a dual clothing tradition, in which rulers and aristocrats adopted different kinds of mixed foreign-influenced indigenous styles, while the commoners continued to use a distinct style of indigenous clothing that today is known as Hanbok.