Never underestimate a great button-up sweater, like this one from Old Navy. At $26.50 from OldNavy.com
, it's the perfect add-on for a breezy summer night or an air-conditioned office. Its lively purple hue gives some kick to an ensemble. Just pair it with fresh whites or a patterned dress, and you immediately elevate your look. Lightweight pointelle and small buttons give this cardigan a touch of innocence, which is why we love that its powerful color packs a fruity punch.