The cardigan has been wrestled out of the hands of grandfathers and geography teachers. It’s the shawl cardigan that’s done it. Traditionally buttoned, this thick-knit style is hardier than your average cardi and feels more masculine. For one that fits under a slim coat, choose a finer material like cashmere. Underneath, go for a button-down Oxford shirt or a navy, grey or cream round-neck tee always works too.