Yeah, that's real. It's a Cubs cap with a 2003 World Series patch, and it was placed in players' lockers late in Game 6 of the NLCS, anticipating a almost-certain Chicago victory.
That famous Steve Bartman game was 11 years ago today, and Eric Karros, part of Fox's broadcast team for Cards-Giants this afternoon, was at first base when Moises Alou lost the battle for a foul ball. Karros has kept the hat with him these 11 years.
Briefly a goat, Bartman has come to represent a random poor bastard forced to live a sports fan's worst nightmare. It could've been any one of us. Go read Will Leitch's thing, and then feel relieved but also sad.