For a laid-back ensemble, go for a beige shawl cardigan and a white crew-neck t-shirt — these items go really well together. When this outfit is too much, dress it down by slipping into a pair of white athletic shoes. As you can see here, it's extremely easy to look awesome and stay snug come cooler days, all thanks to looks like this. Gents wondering how to wear modern casual dressing in your 30s, this combo should answer your question.