FC Seoul's home kits have red-and-black stripes, as in their crest.
FC Seoul wore both red kits and yellow kits in home matches from 1984 to 1985.
From 1988 to 1994, the club's home shirt's main colour was yellow, same as the Lucky-Goldstar Group's company colour at the time.
In 1995, Lucky-Goldstar Group pushed ahead with corporate identity unification and the company colour was changed to red. As a result, FC Seoul's jersey colour was changed from yellow to red as part of the unification project.
From 1999 to 2001, FC Seoul wore red and blue stripes but returned to all red in the 2002 season and In 2005, FC Seoul changed to red and black stripes and this colour has been in use since.
In June 2016, FC Seoul released the 1984–1985 retro jersey to commemorate foundation of the club and the first K League title.[1]
1995–July 1999 2002–2004 Worn red shirts as first kit
July 1999–2001 Worn red and blue stripe shirts as first kit
2005–present Wearing red and black stripe shirts as first kit
Notes
(1) During 1984 season and 1985 season, FC Seoul worn red shirts and yellows shirts by turns as first kit, At that time FC Seoul did't have the concept of first kit and second kit.
(2) In the 1987 season, all K League clubs wore white jerseys in home matches and coloured jerseys in away matches, like in Major League Baseball.
(1) In the 1987 season, all K League clubs wore white jerseys in home matches and coloured jerseys in away matches, like in Major League Baseball.
(2) First kits in 2002 and 2003 were the same, but the colour of adidas logo and three stripes on shoulders were different.
(3) Original 2014–15 first kit had white socks, but white socks were worn only in five matches in March 2014, then changed to red socks. In 2015, name and number printing pont on jersey was changed.
(4) First special kit for the AFC Champions League in FC Seoul kit history.