I must say i'm getting a bit obsessed with the 'culottes'. It can be worn casual like in the picture with sneakers or with heels to make it more lady-like. I would style it the sporty way: with my Addidas Stan Smithies (yesyes they are everywhere, and soon also on my feet, but more about them later!), a white shirt and a cap on my head.
Mango has a great black version at the moment, find it here