 They did not switch to a gray underbrim until 1994, when most teams had been wearing a gray underbrim since the late 1980s.In the 1996 World Series, the Yankees, along with the Atlanta Braves, became the first teams to wear their caps with World Series patches sewn on the side.In 1998, the Yankees had the number #39 sewn on the back of their caps, next to the MLB logo, for Darryl Strawberry, because he was suffering from colon cancer at the time.