Can you wear/use multiple legendary items of the same type?
Yes, you can equip as many Legendaries as you want in whatever slots you have available.
The exception is that you cannot equip more than one of a specific legendary labelled as Unique-Equipped. Note, this does not mean you cannot equip two Legendaries of the same item type or slot type, merely that you cannot equip two that have the exact same name unless one is a legacy item and the other is not. A legacy item will show differently in auction house searches but not in your inventory.