As New York Yankees and Boston Red Sox prepare to take to the field in London for the first time, ESPN's Sam Borden examines what makes the Yankees brand so iconic and recognisable around the world?.With most Yankees caps being worn by non-baseball fans, we look at the strategy behind the famous 'NY.' Subscribe to ESPN UK: http://bit.ly/1oGUzVA Follow ESPN UK across multiple platforms: https://en-gb.facebook.com/ESPNUK https://twitter.com/ESPNUK http://www.espn.co.uk/