I love the simplicity of this outfit.
I can't remember where I found the photo though... It was either Garance Doré or The Sartorialist, but it was a few months back. Waaaay before the weather looked anything like spring here in the Netherlands, but I had hope. ;) Anyway, here's my version of the look for way, way less.
The dress is really a large t-shirt on sale from h&m for €9 and the sandals are from Primark. I think they were €8, could be €10. The belt is from Zara, €30. Imagine, the belt is the most expensive item of the whole outfit. :) I wore it with big gold studs and this black fringe bag from h&m, which I'm pretty sure was about €20.