Marrying an olive crew-neck sweater with cargo pants is an on-point pick for a neat and relaxed ensemble. Add a little kick to the outfit with a pair of navy and white athletic shoes. So as you can see, it's very easy to look seriously stylish and stay cozy when chillier weather hits, all thanks to looks like this one. As you see here, as a 30-something, you have a vast array of outfit options.