I have recommended this before but they should not only allow you to hide your helmets but also hide or change the look of any of your armors.
A lot of games do this in both single player and MMOs. You can choose how your armor appears and are not forced to change your look just because you got an upgrade.
Assassins Creed for example.
If anything they should go further. We should be allowed to recolor the armors in the game as well. Go to a dye shop and recolor those brown leathers black! Because why not!
