In the kingdom of Valencia, Empress Cesia is a formidable ruler who has conquered 99 nations, yet she suffers daily under the oppressive restriction of heavy corsets and multi-layered dresses. Desperate for relief, she tasks her trusted brother and right-hand man, Duke Aenon Lionheart, with an impossible mission: find a designer capable of creating comfortable yet regal attire. This search leads him to Yuri, a talented designer who has recently transmigrated from modern Korea into this fantasy world.
Understanding that a woman's voice holds little weight in the male-dominated guilds of Valencia, Yuri makes a bold choice to cross-dress as a man. Under this disguise, she introduces the concept of "knickerbockers" and sportswear to the court, offering the Empress the freedom of movement she craves. Her designs do more than just provide comfort; they symbolize a shift in societal norms and empower the women of the empire to embrace practicality over rigid tradition.
As Yuri works closely with the royal court, she finds herself in a complicated web of secrets and romance. Duke Aenon finds himself inexplicably drawn to the talented "young man" revolutionizing the Queen's wardrobe, leading to a charming and humorous romantic subplot. Empress Cesia Wears Knickerbockers is a refreshing take on the isekai genre, blending historical politics with modern feminist themes and a heartwarming story of finding one's true self in a foreign land.