The 1964 NFL season was the 45th regular season of the National Football League. Before the season started, NFL commissioner Pete Rozelle reinstated Green Bay Packers running back Paul Hornung and Detroit Lions defensive tackle Alex Karras, who had been suspended for the 1963 season due to gambling.
This season is noteworthy for a change in uniform rules – while the league had dictated since 1957 that the home team must wear a colored jersey and the visitors a white one, teams were now given the option of wearing their white jerseys at home. As a result, the Browns, Cardinals, Colts, Cowboys, Rams, Redskins, Steelers (for one game) and Vikings (except for most of one game in which the Lions forgot to bring their blue jerseys) [1] did so; while the rest reverted to home colors the following year, the Cardinals would not wear red at home until 1966, the Rams would not do so again until 1972, the Browns only once until 1975, and the Cowboys, aside from an unwilling use of their blue tops as the "home" team in Super Bowls, have since continuously worn white at home.
The season ended when the Cleveland Browns defeated the Baltimore Colts in the NFL Championship Game – the last championship for the Browns. Taken from http://en.wikipedia.org/wiki/1964_NFL_season.