Dark Green
Link loved wearing a his signature dark green tunic out of all of the colour palettes for his outfit for the Super Smash Bros. Tournament. Maybe it was because he was more used to it than the colour blue. He wasn't really sure why.
He couldn't figure this out, until he decided to ask Zelda one day.
"Zelda?"
"Yes, Link?" The brown-haired princess turned to him. "What is it?"
"...Why do I usually wear a dark green tunic, and not anything like blue or red or something like that?" Link asked awkwardly. "I'm not sure. Maybe I'm more used to it than the other colours. I'm not really sure..."
"Hmm..." The princess took this into thought for a moment, before she spoke up. "You know that there are past incarnations of us, right?"
"Yes...Is there a point about this?" Link asked, confused.
"I think every past incarnation of you always wore a dark green tunic with a stocking cap. I think that's why you're so used to it." Zelda explained. "I can't remember a time in which you wore a different colour; except for during the Smash Bros. Tournaments."
"What? Seriously?" Link asked, gaping. Zelda merely nodded in response. Immediately, he ran to the library and searched up every picture of him possible.
1st picture. Dark green tunic.
2nd picture. The same.
3rd picture. The same.
4th. The same.
At least a hundred photos of him from his adventures outside of the tournaments later, all of the pictures were the same.
Link immediately started to freak out, and every Smasher kept staring at him oddly for the rest of the day.