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The campaign you see above (the campaign makes me want to wear that vest. I blame advertising for this too. I envy you people) is a french road safety campaign featuring Karl Lagerfeld. It reads "It's yellow, it's ugly, it doesn't match anything, but it can save your life." Below is something I found with a slight recumbence to the safety vest we see all around us on policemen and security guards.
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The photo is from Romain Kremer's Spring Summer 08 collection. Ah how the policemen and security guards would be a pleasure watching with this on.
You could wear this too (that is if you can get your hands on them) when on a walk at night in this LOVELY GOD' OWN COUNTRY of ours (please forgive my sarcasm) where street lights don't work.