Detroit Express T-Shirt

Founded in 1978, the Express were a football team that played in the North American Soccer League (NASL) until 1981. They signed England forward Trevor Francis on loan, who scored 36 goals and provided 18 assists in only 33 games. Prolific. In S05E04 of It's Always Sunny In Philadelphia, Mac can be seen sporting a rather snazzy Detroit Express t-shirt, not too dissimilar to this.