The jeogori (Korean: 저고리 Korean pronunciation: [t͡ɕʌ̹ɡo̞ɾi]) is a basic upper garment of the hanbok, a traditional Korean garment, which has been worn by both men and women. Men usually wear the jeogori with a baji or pants while women wear the jeogori with chima, or skirts. It covers the arms and upper part of the wearer's body.
The jeogori has been worn since ancient times and went by a variety of names such as yu (유, 襦), boksam (복삼, 複杉), and uihae (위해, 尉解) in the Three Kingdoms period (57 BC - 668 AD). Although it is unknown when the term jeogori began to be used to refer the garment, it is assumed to have appeared in the late Goryeo period around King Chungnyeol's reign. The first historical document to mention the jeogori is Cheongjeonui (천전의, 遷奠儀) for Queen Wongyeong (원경왕후), which was a funeral ceremony for carrying the coffin out of the palace. The document written in 1420 during the second reign of Sejong the Great records jeokgori (赤古里) and danjeokgori (短赤古里). However, it is not clear whether the record is a hanja (Chinese character) transliteration of a Korean word or Mongolian influence. Before the Goryeo period, such an upper garment was referred to as "uihae" (위해, 尉解) in Silla. As the uihae was a transliteration of the Silla language, dialect forms such as uti and uchi still remain to present.
The basic form of a Jeogori consists of gil, git, dongjeong, goreum and sleeves somae. Gil (길) is the large section of the garment in both front and back side and git (깃) is a band of fabric that trims the collar. Dongjeong (동정) is a removable white collar placed over the end of the git and is generally squared off. The goreum (고름) are coat strings attached to the breast part to tie the jeogori. Women's jeogori may have kkeutdong (끝동), a different colored cuff placed on the end of the sleeves. The form of jeogri has been changed as time goes by.
There are several types of jeogori according to fabric, sewing technique, and shape.
The earliest known depictions of the jeogori are on Goguryeo murals.
The original silhouette for Hanbok Jeogori shared similarities with the clothing of the ancient nomadic people of Eurasia due to the cultural exchanges that ancient Koreans had with the Scythians. The ancient jeogori had an open form, a collar which crossed to the left, narrow sleeves, and was hip-length which were similar features found in the Scythian clothing-style. Some ancient jeogori also had a front central closure similar to a kaftan; this form of jeogori with a central closure is mostly found during the Goguryeo period and was worn by people of lower status. The jeogori initially closed with the front, central closure; it then changed to left closure before changing again to right closure.
The change in collars direction from right-to-left (i.e. left closure) to left-over-right (i.e. right closure), along with the use of wide sleeves, which are found in many jackets and coats were due ancient Chinese influences; these Chinese influences on the jeogori are reflected and depicted in Goguryeo paintings. The closure of the jeogori on the right side is an imitation of the Chinese jackets. The closure to the right became an accepted standard since the sixth century AD.
The Jeogori of the Ruling class of Silla is influenced from Chinese Tang influence in the Silla Dynasty by Kim Chun-Chu (648CE). But the most commoners wore only a style of indigenous Jeogori distinct from that of the Ruling class of Silla.
Previously in Korea, jackets were worn over bottom garments.
In the 16th century, women's jeogori were long, wide, and covered the waist. The length of women's jeogori gradually shortened. A heoritti (허리띠) or jorinmal (졸잇말) was worn to cover the chest.  This was to fit in style with a large wig and skirt. 
In contemporary Korea, the sumptuary laws within different social classes were lifted and colors, decorations, and fabrics that were exclusive to the upper classes were open to all classes. This allowed for the growth of diverse traditional design elements in hanbok styles. However, in the 20th and 21st centuries, traditional Korean clothing has not been worn every day by most people. Hanbok became more reserved for special events, such as ceremonial or bridal wear, which carries onto current time. During their own engagement celebrations, women may wear pink jeogori. After they are married, women may wear indigo jeogori. Additionally, modern silhouettes are commonly slimmer and more simplified then historical styles.
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