PARIS — The fascination with the folkloric and the romantic that’s informed the spring season on both sides of the Atlantic was echoed in the strong collection Marc Jacobs showed for Louis Vuitton. There was plenty of intricate detail work, such as metallic python binding and remarkable patchwork, along with many terrific items. Here, the embroidered leather coat and matching boots. For more on the season, see pages 12, 13 and 16.