finney:
i feel like he'd wear a ring. just one ring with a deep meaning. the ring could be a gift you get him, but no matter what he always wears it.
robin:
is this even a question? his signature bandana. however, if not, i feel like he would for sure have a hand made necklace of some sort if you get me.
vance:
a black leather braided bracelet securely placed on his wrist. it even would have blood stains from all his previous fights.
bruce:
a beanie or a cap. the cap would be all worn out but it would be cute and suit him so much.