Gyeongbokgung Palace, the main royal palace of the Joseon Dynasty, attracts many visitors wearing Hanbok. When renting a Hanbok, you'll need a place to store your original clothes and bags. You can use lockers inside Gyeongbokgung Station or the storage services provided by Hanbok rental shops.
Lockers near Exit 5 of Gyeongbokgung Station are closest to the palace entrance. They fill up quickly on weekends, so arriving early is recommended. Be sure to check operating hours if visiting for the night opening.