Including under-$100 picks from Free People, Topshop, and Mango. Being a former sweater designer, I’ve seen hundreds of yarn, patterns, and silhouette combinations—and yes, I do have a favorite.

I found lookalikes from $27. Jennifer Lopez might be known for her glamorous red carpet looks, but it’s her off-duty style that has me swooning. The Unstoppable actress recently wore the coziest ...