The longline cardigan has a sizing problem that nobody talks about enough. Most of them are cut for a body that doesn’t exist, so you end up choosing between a chest that fits and a hem that rides up, or a length that works and shoulders that look borrowed. We’ve been specifically looking for options that get the proportions right without asking you to size up and lose the shape entirely. Done well, a longline cardigan is one of the most useful layering pieces a wardrobe can hold. It sits over a shirt or a tee with equal authority, works open or closed, and takes you somewhere between relaxed and considered without much effort. The weight of the knit matters here as much as the cut. Too thin and it drapes badly. Too thick and the length becomes overwhelming. The ones we’ve picked thread that needle properly. No compromise required.