The third film in the Enola Holmes series reflects the spirit of the era while incorporating modern elements. Oscar-winning costume designer Consolata Boyle states that every fabric, silhouette, and color choice is designed to reveal the inner worlds of the characters. This approach allows the film to transcend being merely a historical remake.

Boyle emphasizes that costumes are an important tool for reflecting the emotional states and developments of the characters. This way, viewers can witness not only Enola's appearance in her adventures but also her internal conflicts. The combination of Victorian aesthetic and modern design elements enhances both the visual and emotional depth of the film.

Achieving this balance in costume design makes Enola Holmes' character development and the progression of her story more meaningful. Viewers can better understand the thought behind each outfit and the transformations the characters undergo. Thus, the film offers audiences a profound experience, going beyond just being a detective story.