Samu-Jussi Koski is a fashion and costume designer. Koski has studied in the LAB Institute of Design and Fine Arts (Finland) and the Polimoda Fashion School in Florence (Italy). Koski has previously worked as a designer and artistic director with Marimekko (2004–2009). He has also founded the fashion brand Samuji, where he also acted as the artistic director until 2021.
Nowadays Koski works as a designer and freelance costume designer. In his work he is interested in exploring the internal conflicts of the characters and how they can be presented in the creations.