It was made very clear in 1908 that the Boston Americans were now officially the Boston Red Stockings, or Red Sox. the shortened version of the Sox was taken from the Chicago White Sox who shortened their name to disassociate themselves with the Chicago White Stockings, in part. For the most part, it was likely that they shortened the name to get the most space from newspaper accounts of the games.
A red stocking symbol was placed on the chest at center, slanted with the name "BOSTON" running down to the heel of the stocking. This was the first time, on an American League jersey, that a team nickname was pictured.