The nickname of the Crafty Cockney was given to Eric Bristow when he visited an English pub by that name in 1976 during a visit to Santa Monica. It became a nickname which stuck with him throughout his career. Bristow wore a dart shirt (which he received from the same pub) depicting a uniformed British policeman, a Union Flag and the title Crafty Cockney whenever he took part in a tournament.
Sky Sports once used a player cam for video coverage of darts. A tiny camera was fitted to Dennis Priestley's dart shirt to capture his view of the action while playing.
He is nicknamed "The Menace", in relation to the Dennis The Menace cartoons, and reflects this by wearing Red and Black striped dart shirts and outfitting his arrows with red and black flights.
Wayne Mardle is known as "Hawaii Five-O-One" and sports colorful Hawaiian shirts at darting events, a play on words from TV show Hawaii Five-O and the starting score in a leg of darts.
Bob Anderson has been a professional for several years and has worn a selection of dart shirts which, as with Bristow, led him to a nickname. The shirts are usually a western style - or a cowboy style - and as a result Sid Waddell called him The Limestone Cowboy. The name stuck and he always plays under that moniker now. The Limestone Cowboy also refers to the limestone hills of Wiltshire where Bob used to live.
The majority of professional darts players now have nicknames, a trend which is said to have started with Eric Bristow and his dart shirts. When the Professional Darts Corporation circuit started in 1994, it became almost customary for every player to use a nickname. I myself compete with players by the names of Dirt, Big Dave, Chief, Rey Rey, Fred "Ton 60" Garza, T-Rex and others. All of which have their own unique dart shirt to further their dart playing persona, individuality and expression.