<P> A third jersey , alternate jersey , third kit or alternate uniform is a jersey or uniform that a sports team wear in games instead of its home outfit or its away outfit , often when the colors of two competing teams ' other uniforms are too similar to play easily . Alternate jerseys are also a means for professional sports organizations to generate revenue , by sales to fans . Of North American sports leagues , the NFL generates $1.2 billion annually in jersey sales , with the NBA second selling $900 million annually . Another use of the alternate uniform is for identifying with causes , like the Central Coast Mariners wear an alternate pink kit on pink ribbon day . </P>
when do football teams wear their third kit
too similar to play easily to generate revenue for identifying with causes