What is the ethnic origin of the traditional dresses on those pictures ?
Correct answers :
From left to right on each row :
越服/Việt Phục (Vietnamese clothing), 漢服/hànfú (traditional Chinese clothing), 韓服/hanbok (Korean clothing), 和服/wafuku (apananese clothing).
The reason why they looks so similar is because they have been influenced by traditional Chinese clothing.
The East Asian cultural sphere comprise the Chinese, the Koreans, the Japanese, the Ruuchuu and the Vietnamese who have all been influenced mostly by traditional Chinese culture which explain their similarity.
Source :
Những kiểu trang phục phổ biến trong lịch sử Việt Nam và các nước đồng văn :