Well... I just thought of sumething.
If Utada gunna sing her old songs, it's more suitable that she wear sumething normal. Meh... It would be hella weird if she's singin' her old songs wearin' fancy outfit! Haha... Dun't you think so? Maybe this is the reason why Budokan dressed like this and this concert like this. And maybe this is why the concert tracklist arrangment is like this?