Grandpa cardigans are best enjoyed when they’re designed in luxurious cashmere — leave that scratchy wool for your Bompa. Peter Johnston have a version available right now made from 12 ply Scottish cashmere that’s geared to keep you warm and stylish at the same time. The design process alone involves around 40 separate processes, many of which are carried out by hand. Available in navy, flannel grey, black, claret, tartan green and pale blue.