. . .several French dioceses, seeking to promote their 2018 fundraising drive, had a few young Catholics take a selfie with a young priest. It was the perfect marketing image of diverse, democratic youth—but for one problem. The priest wore a cassock. This long black garment, with its thirty-three buttons, is favored by young priests who have made it the uniform of resurgent tradition. It is the symbol of what young Catholics are, and of what older Catholics don’t want them to be. . .