Each team has what the NFL likes to call a closet. Each team has a "primary" section that consists of the usual home and away uniforms. Some teams have an alternate uniform (think Color Rush.) And then some teams have their throwbacks, or what the league calls "classic" uniforms.

The NFL on Monday expanded the number of times that teams can wear alternate or throwback uniforms in a given season. The prior limit was three; the new maximum is four. Last year, the NFL increased the number of different helmets a team can wear in the same season to three.