While the blue-button-down is no stranger to my wardrobe, it's not exactly been in heavy rotation lately. But that's all about to change thanks to these chic European girls, pictured here, who are deftly demonstrating--and reminding me!--that it's the ultimate (neutral/easiest/throw-on-and-go) foil to all-out statement skirts, pants and even jeans. Here are some amazing iterations from , , , , , , , and .