I really love my slim leather belt, it's from H&M.
I think that the best quality of a belt like this one, is that it can become many different accessories:
A single belt
I bought three identical belts, and I link one to the other in order to make them a very long belt, which I pass around my waist many times.
Like a modern obi :)
Sometimes I like to link many slim belts, different for colour/material, the combination is always something particular.
My favourite way to wear a belt is fixing it with a knot.
In this way it doesn't matter the right lenght of a belt compared with the waist, but
on the contrary, is always better a longer belt, to make a bigger knot.
Like a long necklace.
It's possible to put in it many charms (also linked in the buckle)
or put many bangles, like Dries Van Noten in Fall 2008.
Like a tie
Also here, it's possible to link to the buckle one or many charms.
Like a choker.
Like a cuff/bracelet.
Like a head band.