In Super Smash Bros. Ultimate, one of Mario's most curious costumes is a green shirt, similar to his brother Luigi. However, Luigi does not have a red shirt to mimic his brother. He has pink and orange outfits, but not red. If the two of them don't have matching outfits, then the question remains of why Mario specifically gets an outfit in his brother's signature color.
Although Mario's green outfit is not a perfect recreation of Luigi's, with brown overalls instead of blue, it still makes one wonder. It may seem bizarre, there are a few instances throughout Mario's history that could provide a reason why the famous plumber could be wearing green. Although Mario may have Smash's most outdated moveset, his past games do contain the necessary clues to solve this mystery.
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In Mario games, dating all the way back to the original Mario Bros. arcade game, it has always been a tradition for Luigi to be the character for player 2. Since in most platformers, especially the older games, Luigi plays identically to Mario, he could be seen as Mario's Player 2 costume. When looked at it this way, giving Mario a green costume in Super Smash Bros. Ultimate makes sense. If Luigi has been Mario's Player 2 for so many years, then giving Mario a green Player 2 outfit in Smash Ultimate seems like a good nod to the history of gaming's most famous twins.
Another reason that could be pointed to is the fact that Mario has actually dressed up as Luigi before. In Paper Mario: The Thousand Year Door, there is a badge called the L Emblem that changes Mario's color palette to match Luigi's. It is a cosmetic change with no real use aside from completing one quest in the game, but it does
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