Ever since the schedule for Paris fashion week was published, there have been unhappy mutterings about the fact that yesterday, the third day of shows, coincided with Yom Kippur, one of the most important holy days in the Jewish calendar and one on which adherents are forbidden to work. The American designer Marc Jacobs put his show for Louis Vuitton back one day, while prominent Jewish fashion journalists and buyers made it known that they would not be attending shows.