Chanel’s honeymoon period with the new designer Matthieu Blazy is showing no signs of cooling. Blazy’s fifth catwalk show – on the Biarritz beachfront where the young milliner Gabrielle Chanel opened a couture house in 1915 – was an irresistibly seductive love letter to the enduring allure of the double-C logo. The day before the show, sales assistants at the Biarritz boutique were holding up Chanel beach towels on the shop floor to create extra changing room space for shoppers impatient to buy jeans at €3,100 (£2,690) a pair. Blazy’s jeans are becoming a totem of the new Chanel, which, in aesthetic, although certainly not in price, marries high taste with an inclusive, democratic point of view. Photograph: Stéphane Cardinale/Corbis/Getty Images In a casino ballroom with a beachfront view over surfers riding the Bay of Biscay waves on to golden sands, Chanel skirt suits came in pink denim, or in tissue-fine silks worn over sporty tank tops.…