The Yves Saint Laurent "Tribute" Mary Janes are this season's must-have shoes. In London, they are sold out and there is a waiting list of 200. On American eBay, the last resort for a desperate shoeaholic, they are changing hands for $1,295 (£648). The shoes come in three colours: black (with a cream-coloured heel), red or purple, and two heel heights; four inches or five-and-a-half. At the front they have a one-and-a-half inch platform and a thin ankle strap.