This turban was used by Professor Quirinus Quirrell to hide the face of Lord Voldemort after the Dark Lord possessed him. He used it after he failed to steal the Philosopher's Stone from Gringotts Wizarding Bank. Quirrell's story was that an African prince gave him the turban as a thank-you for getting rid of a troublesome zombie. Whether he only made up the turban part or the whole tale is false, we do not know. The turban had an odd smell possibly caused by Voldemort's face and so Fred and George believed that the turban was stuffed full of garlic to ward off vampires.