You better work, girl. Our current quest here at ASOS is determining how to revive yawn-worthy workwear, and how to push your regular-person wardrobe into some semblance of profesh. The latest look lift comes courtesy of mega-blogger Pernille Teisbaek, who brings new life to the trusty white shirt with this trick. If it's desk jockey day, wear it like a regular shirt. Shift into breezy weekend gear by leaving two bottom buttons undone and tying a quick knot on one side. So simple, so chic, so stealing this genius. Thanks, PT!

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