Druid probably has the most class specific gear, particularly caster gear, in terms of options. It just seems to have a slightly lower drop rate, which is understandable as it is one class. Three classes (not to mention PRC's) use stealth gear, which is probably why there are so many more stealth items, and if they choose to use them, they are crucial
As for gear, yes. Metal armour, gear, is not allowed. Rings, weapons, those are fine. Otherwise crafted chitin is most likely your best bet to wear.