Celebs started with Berets which morphed into fedora's which in turn some how developed into an over the top Top Hats. The hat which Mary-Kate freakishly wore in late august, was not due to her creativity but was actually inspired by the runways of Fall 2007 including that of Commes Des Garcons.
Soon after Liv Tyler and Sienna Miller were also spotted in them. Fast Forward a few weeks and you've got the likes of Christian Dior further emphasising the trend, by stepping out at his show in one along with ones from his Spring 2008 collection.
If your going to mess with your head you might as well do it in an all out crazy way with a Top Hat!