This laid-back combination of a brown crew-neck sweater and white jeans is very easy to put together in no time flat, helping you look amazing and prepared for anything without spending a ton of time searching through your wardrobe. On the fence about how to finish this look? Rock casual boots to rev up the fashion factor. This is a foolproof option for a neat ensemble that transitions easily into spring. Those who are curious how to sport smart casual looks as you make your way through your 20s, you have your answer.