Celtic 1988 Centenary Retro Green Tee. The Celtic 1988 Football Centenary Retro Green T-Shirt is a nostalgic and iconic piece of sportswear that pays tribute to a significant milestone in the history of Celtic Football Club. This retro t-shirt commemorates the club's centenary year in 1988, a time of celebration and pride for Celtic fans.PersonalisationName & Number - Customise your jersey with the name and number of your favourite Celtic player or even your own name. We can print name in the same style worn by the players.