As much as I want to see Sora and the others in armour, I think they don't need one.
See, the armour serves to protect the wearers from the darkness of the Lanes Between, similar to how coats protect the wearers from the darkness of the Corridors of Darkness. Sora has been travelling with a gummi ship and it seems to be going all fine and dandy, at least up until now.
Conversely, gummi ships hadn't been invented yet during TAV's time, which means the armour is a necessity. And after everything has been settled, I wouldn't be surprised if TAV forgo their armour and gliders in favour of gummi ship to travel around, because it's more convenient and probably safer that way. Besides, if we're to apply real-life logic here (which we probably shouldn't), a suit of armour isn't light.
So yeah, I agree with Swoosh. Unless there's a solid reason, I'd rather Sora and co. don't don armour, because it'll make it look like it's just for fanservice we all can do without.