There are also two buttons on the character panel you can use to hide helmet or cloak and show.
After the match is done you'll return to your spot where you queue from (WOTLK like). helm - it will only autohide helm in resting zone. Heres the list of options: on - it will autohide both helm and claok in resting zone.
To do that just go to the interface settings and select addons or use slash command /hh