The Maglia Rosa has been GC leader of the Giro d’Italia since 1931.
Like the Tour’s yellow jersey the colour comes from the newspaper that used to sponsor the jersey La Gazzetta dello Sport. There have been many manufacturers of the pink jersey including Asics, Fila, Castelli and the current manufacturer Santini.
Each year the jersey subtly changes. The version above was from the 84th edition of the race that was held in 2001.
Here’s what Wikipedia says about that race:
“The 2001 Giro d’Italia was the 84th edition of the Giro d’Italia, one of cycling’s Grand Tours. The Giro began with a 7 km (4 mi) prologue that went from to Pescara. The race came to a close on June 10 with a mass-start stage that ended in the Italian city of Milan.Twenty teams entered the race that was won by the ItalianGilberto Simoni of the Lampre-Daikin team.Second and third were the Spanish riders Abraham Olano and Italian Unai Osa”