The man who donned the outfit did so in honor of Jim Rice joining the Red Sox. Hence the red socks on his feet. Unfortunately the mask represents the days of "Jim Crow". His victory pose obviously signifies the home run that propelled the team to game 7 of the World Series back in '75, although it was Carlton Fisk who hit it.
best one i've seen for that template is "when your armor doesn't match, but you have the best stats". having played a number of mmos and the liked, that really tickled my fancy.