Eddie Izzard Unplugged
Here's a great photo of Eddie Izzard in 'marathon man' mode.
Eddie also has a 'girl mode' which he switches over to just by putting on a dress, high heels and applying some lippy apparently.
Now like most folk I don't much care if Eddie dresses up as a woman, but I don't believe Eddie literally becomes a woman just by putting on a costume - because he's a bloke, a man, a biological male.