If anyone should be as obsessed as I am with those beautiful robes, clothes and hats in Korean sageuk dramas, more information on the complicated dress codes (esp. of Joseon nobles and the royal court) can be found in FREE downloads at the website of the National Folk Museum of Korea.
Encyclopedia of Traditional Korean Clothing
https://folkency.nfm.go.kr/en/main
(scroll to the bottom of the page under the header Dictionary Download)
Free and legal!
