 The jerseys matched their new sister team, the expansion Seattle Sounders FC of Major League Soccer who wear green jerseys with blue pants.On December 6, 2009, the Seahawks wore their Seahawks blue jersey with the new dark navy blue pants for the first time, in a game against the San Francisco 49ers.The Seahawks broke out the same combo two weeks later against the Tampa Bay Buccaneers, and two weeks after that in the 2009 regular season finale against the Tennessee Titans.