In the early 1970s,Major League Baseball(MLB) teams began to experiment with numerous designs instead of the same uniforms , ranging from popular designs and not so popular.

   In 1972,new MLB Jerseys were introduced to the team by the Oakland Athletics' flamboyant owner,Charlie O. Finley. Taking after the lead of the Pittsburgh Pirates, the jerseys were pullover spandex that would later catch on in MLB (though this would be phased out by the early 1990s in favor of the more traditional button-down jerseys), but by going one step further than the Pirates, the A's introduced alternate gold and green jerseys. The gold jerseys, lighter in color, were considered "home" alternates while the darker green jerseys were considered "away" alternates.

   And then,many different colored jerseys were catching on. The Pirates even went as far as to having a rotation of which jerseys to wear, matching white pinstriped, gold, and black pants to wear with jerseys of the same color. The white pinstripes were later phased out in favor of solid white.

  For examples,the Milwaukee Brewers wear their 1978-1993 home uniforms for every Friday home game. In 1998, the Seattle Mariners hosted the Kansas City Royals for a game where both teams wore "futuristic" uniforms meant to represent the year 2027 (what will be the Mariners 50th season). The promotion was so successful that it was copied the next year by 20 MLB teams, this time representing the year 2021 (due to sponsorship by Century 21), however the jerseys were roundly ridiculed and have not been seen since. The Toronto Blue Jays change from their traditional blue and grey jersey to a red alternate jersey every Canada Day to help celebrate the National Holiday. In 2007, the Jays announced that as part of the team's popular "Flashback Friday" promotion, the team would use replica uniforms based on the powder-blue road uniforms used in the 1980s at all Friday night home games, starting with the 2008 season. To complete the look, the Jays also wear the original blue and white caps, with their traditional logo on the front of the uniform as well as on the caps. The Cincinnati Reds, Washington Nationals, Boston Red Sox and the Atlanta Braves wear a red jersey for every home game played on Sunday. The Pittsburgh Pirates wore a red alternate for every home game played on Friday during the 2007 season, even though red is not an official team color.

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