What did Pre-Modern Koreans consider to be fashion?

Cheojori

Paji

Dop'o

Based on my guess and understanding, the Cheojori and Paji are what Jeans and Polo T-Shirts are to men today. The newer version of the Paji had wider legs to facilitate squatting in the fields and performing agricultural work. The newer Paji is practical since the Choson society was centered around Agricultural activities. From my awareness of pre-modern chinese civilization, the Paji and Cheojori closely resembles what the commoners and peasants in China wore. Looking at the design of the Paji and Cheojori, it is evident that Chinese society and its culture had a huge influence on its Korean counterpart.
The Dopo is a scholar overcoat that was introduced  in the middle of the Chosun Dynasty from 1392 onwards. Besides being worn by scholars, the Dopo was also worn by commoners during special occasions or family rites. Interestingly, the Dopo closely resembles the Japanese Kimono dress. I would assume that the Dop'o was somewhat influence by the Japanese culture, though not totally. Kimono was worn by women in Japanese culture, however, the Dop'o is worn by men as well and  is worn over other layers of clothing.
Do Check out the link here: http://www.lifeinkorea.com/culture/clothes/clothes.cfm if you guys want to find out more about traditional Korean Clothings