Spring dressing is all about layers. You know this. And while these extra layers certainly serve the functional purpose of regulating body temperature, there’s an added bonus: They look good. Done correctly, they look great. Take the cardigan, for example. Its the perfect way to dress up a casual look, or add some color to an otherwise monochromatic outfit. It can look academic in a cool college professor sort of way when paired with a blazer, or it can look insouciant over a T-shirt and jeans. It can help Woody Allen look stylish, and hell, even freaking Einstein wore one. Which is to say, it’s something you should have in your wardrobe. Lucky for you, we’ve found 15 options to stock your closet with this season. Check ‘em all out in the slideshow.