All three costumes are made by Korean fashion designers, not luxury brands. First of all, IU‘s white jacket and skirt are designer Baek Ji-hoon’s “Jaybaek Couture” fashion. Jaybaek Couture is famous for being worn by BTS, Shin Min-ah, Hyun Bin as well as IU.
The dress IU wore during the round interview is a YCH dress by designer Yoon Chun-ho. IU often wore the brand’s products at award ceremonies.
Meanwhile, IU attended the 75th Cannes Film Festival with the movie “Broker”. Song Kang-ho, who took the lead role, became the first Korean actor to win the Best Actor award at the Cannes Film Festival.
Source: Wikitree