I'm trying to make a team only accessory but I have no idea how. Can anyone help?

I'm making a horror game, and the killer chosen is put on the 'Killer' team. I know how to add clothing for it but not accessories. This is a stupid question, but how do I make a team only accessory, so that only members of a team will have the accessory? I've looked everywhere and all I'm finding is stuff like 'team only gear'.