The Robe is a Vanity Item that appears to resemble a magician's Robe. There is a subtle walking animation whilst wearing the Robe. The Robe looks very similar to Tim and the Dark Caster's robe, the only exception being that their robe is torn, showing their feet.
If the player is using a weapon/tool or is holding a torch/candle or placing blocks while walking or jumping, the robe animation does not work. Also, the bottom portion of the pants become visible, poking out from the side of the robe.
If the player has angel/demon wings and is equipping a robe, when the player flies/glides with the wings the robe animation does not work.
When you put the robe on a mannequin and put pants or greaves under it the lower part of the robe will be replaced by those pants.