I always thought it looked kind of stupid when Tidus wore Abes clothes during the tournament in Luca.
I doubt it would take up massive memory space to change his suit for ten minutes, it would make the whole tournament look more professional and believable.
Having Tidus as an Abes player in an Aurochs team is like hiring a Dallas Stars player into Colorado Avalanche but still letting that player go dressed as a Dallas player.
Yeah I know it isn't a big deal, but I just found it kind of... unnecessary.
The Blitzball mini-game doesn't matter too much since it isn't connected to the storyline, but he could've at least worn Aurochs clothes during the storyline tournament, it wouldn't exactly hurt.