Armor type of druids on WOW?

Answer 1

Cloth and Leather. That's it.

Base form is Leather, but all 3 trees can increase your base armor:

Balance: You'll likely be moonkin after level 40, which makes you more like a shaman, but with a mage's dps. Moonkin shifts your armor up to the likes of mail.

Bear Form: Level 10, increases armor to the value of mail and stamina slightly, making you like a warrior with warrior related spells.

Dire Bear Form: Level 40, moves your armor up to plate value, and increases your stamina greatly. Fantastic for tanking.

Tree of Life/Travel Forms, and your regular form: Restoration grants a talent that boosts your armor in between leather and mail, but close to mail and your travel form and regular form the same way.

Cat Form: This form keeps the same armor, so its like the rogue, armor and everything.

Order of Armor Value:

Cat Form; Leather (rogue armor)

Travel Form and normal Form; less then Mail, more then leather.

Tree of Life Form; slightly less then mail. (near shaman)

Moonkin Form; Mail (shaman)

Bear Form; Mail (low level warrior)

Dire Bear Form; Plate (High level warrior)