It's a cozy day, you've enough time to go out for a walk or to meet your friends in the city.The weather outside is not the best but anyway warm.What to wear on a day like this?A simple grey shirt!Nicole and Mary-Kate show that this basic piece can look amazing with jeans and a few accesoires like funny shades, painted nails or a few bracelets.I'm sure Kate Moss know exactly how to wear a grey shirt but maybe the paparazzi who took this photo of her caught a bad day.I really love my casual grey shirt and if I don't know what to wear I pick it and 'pimp' it with various bracelets.A perfect casual look for everyday and especially for school.