It came as part of a monthly subscription called My Little Box, which sends boxes full of goodies. The subscription is currently only available in France and Belgium, but if you are not in those areas, you should check out the affiliated website, My Little Paris.
I love the simplicity of this cable knit headband. I hope to make something similar with this really soft Rowan Pure Wool 4 ply yarn I have in "toffee."
The yarn says to use a US size 3 needle, but I might go with something bigger to achieve the relaxed look of the headband in the picture.