In 1998, Hirofumi Kiyonaga launched his clothing brand SOPHNET. (originally SOPH., renamed in 2002) in Tokyo, drawing inspiration from music, art, architecture, and other cultural elements, and bringing functional clothing into the fashion world. He later founded FCReal Bristol (FCRB), a brand rooted in football and maintaining a long-term partnership with Nike, and collaborated with Hiroshi Fujiwara to create uniform experiment. Beyond his clothing brands, Kiyonaga, along with Fujiwara and Hiroki Nakamura, co-founded the website Honeyee and opened a concept space called KIYONAGA & CO. in his hometown of Fukuoka, Kyushu.
