Each character can equip 10 pieces of gear, including a main weapon, an off-hand weapon, a suit, leg guards, arm guards, a helmet, a pair of boots, a necklace and two rings.
Characters taking different professions will take up different off hand weapons. For example, Warrior can have a weapon or a shield held in his off hand, a mage's book is a good option for Mage and Assassin may pick up a dagger as the off hand weapon.
With a click on the Hide button, you can make your equipment invisible. By doing so, other players won't be able to see what type of equipment you are currently wearing, let alone its attributes.