"(Their garments will be of tar)" means: their shirts. Al-qitran (tar) is that which is smeared upon camels. Mujahid said regarding "(Their garments will be of tar)": that it means molten copper that has reached its peak heat. "(And the fire will cover their faces)" is like His saying: "(Is he then who will face the evil of the punishment with his face [on the Day of Resurrection]?) [Az-Zumar: 24]"—meaning: he will be dragged upon his face into the Fire.