Lanvin just moved into impressive new headquarters in the trendy 10th arrondissement: a listed, 18-century mansion with an oval reception room, gobsmacking marble floors, frescoes and a charming garden out back. Artistic director Peter Copping’s pre-spring collection held up to the very, very pretty surroundings of the Hôtel Botterel de Quintin, his lean, soigné silhouettes and feminine detailing pleasing the eye as much as the decor.