Effortlessly blurring the line between cool and relaxed casual, this pairing of a navy shawl cardigan and a charcoal crew-neck t-shirt will likely become your go-to. To infuse a dash of stylish nonchalance into your look, complement your outfit with white canvas low top sneakers. As you imagine, this is a kick-ass idea when spring arrives. Those who are curious how to wear cool casual looks as you make your way through your 20s, you have your answer.