It’s difficult to imagine the late Karl Lagerfeld, creative director of Chanel and Fendi, standing in line at a Primark store – and I doubt current Chanel creative director Virginie Viard has ever rifled through its famous discount bin. The deeply stylish French luxury brand couldn’t be more different from the Irish fast-fashion retailer. And yet one of the most luxurious brands in the world and one of the least have one thing in common: both are steadfastly ignoring the e-commerce boom. Today, you can buy Chanel fragrance, cosmetics, skincare and sunglasses online, but if you want to purchase any...