So far I haven't seen this discussed anywhere. Only now I realized that the BotW Link doesn't have a green tunic. The green tunic has been a tradition in the Zelda series. It has always been given to the hero who has the Triforce of Courage. I thought the blue clothes are just his usual clothes and he will receive the green tunic later, but so far we have seen lots of footage and he always was wearing his blue clothes. Prior to the release of all the other Zelda games, Link was always shown in his green tunic at one point. So what does this actually mean? Is there any meaning behind this at all? Well, it's a stretch, but considering that the game plays in the demise of Hyrule timeline after Link was killed, what if the BotW Link is actually not Link? Not the descendant of the Hero of Time? Or it could simply mean that he will get green clothes later in the game.