Cozy winter sweaters have the uncanny ability to go from elevated and stylish online to frumpy as soon as you try them on. To reduce the risk of delivering grandpa-level 'chic,' we found designer-style sweaters that nail cold-weather style without bulky silhouettes . . . and they're all available on Amazon. Functional and fashionable, these 15 warm sweaters have relaxed-fit silhouettes that still flatter, offering a middle ground between curve-hugging styles that squish and ill-fitting picks with shapeless designs.