This isn't really a big deal but it's something that's kinda bothered me over the years.
I'm sure a lot of us like to change our looks as we go through the game, we're not wearing the exact same thing through the entire MSQ especially with how you unlock increasingly more new things as you progress.
So with that said it's kinda disappointing and slightly immersion breaking when the game will do a big flashback sequence where your character is wearing the same thing as they are currently - I'm sure if you've played through Endwalker you know what I'm talking about especially with how that section encourages you to use a specific glamour prior to the cutscene.
Obviously I don't expect the game to keep an exact snapshot of what my character looked like at every point in the story, but I feel like these types of flashbacks would hit a lot harder if they'd at least put you in level-appropriate job gear like they do at the start of ARR or in the DRG level 80 quest.