This study analyzes historical drama costumes as a domain of popular culture through an examination of the changing process, factors, and design characteristics of historical drama costumes according to trend changes in historical dramas after the 2000s. Public interest in Korean traditional clothing has grown due to the historical drama fever. Research results are as follows. First, historical dramas are divided into: authentic historical dramas, popular dramas, and fusion dramas. Historical drama costumes show characters`` status and roles to help viewers become absorbed in dramas and increase understanding the historical periods and knowledge. Second, the characteristics of TV historical drama costumes (according to changes of the historical dramas according to 2000) brought diversification as they are diversified by period, genre, and character and costumes which are suitable for them additionally resurfaced. Third, as for the design characteristics by type in TV historical costume after 2000s, authentic historical dramas`` design was done by comparatively in-depth historical research based on historical materials to help public understand the past. Popular historical drama costumes are based on history, but the forms of costumes were emphasized (or exaggerated); in addition, colors, subjects, and patterns were modified to emphasize image beauty, dramas`` atmosphere, and characters by reflecting intention. The fusion of historical dramas`` costumes attracted the attention of the public about Korean designs that harmonized tradition with modernity to actively reflect current trends in past periods and show new types of creative design.