The white coat does not make the miller.
More Italian Proverbs:
He would drown in a spoonful of water.Italian
The injurer never forgets.
Italian
Better give the wool than the sheep.
Italian
It is better if you could say "Here he ran away" than "Here he was killed."
Italian
The gardener's dog does not eat lettuce and will not let others eat it.
Italian
On a fool's beard the barber learns to shave.
Italian