 A navy blue cap with a white interlocking "NY" logo is worn with both uniforms.Contrary to baseball legend, the Yankees did not start wearing pinstriped uniforms to make Babe Ruth look slimmer in the late 1920s and 1930s.In truth, the Yankees briefly added pinstripes to their uniforms in 1912, then readers them on a permanent basis soon after Ruppert bought the team in 1915.