I've seen this giant jean hanging at the entrance of a boutique of jeans in Montmartre this weekend. Very attractive! However I wonder if they would have many Chinese clients, as most Chinese people believe that it brings bad-luck passing under trousers :P
You may also notice a poster written "Fête des Vendanges" put on the door. Fête des Vendanges (festival of grape harvest) is actually an annual festival taken place every second weekend of October to celebrate the vintage from Montmartre. Last for 3 days, there are parades, folk music, and wine of course.