To achieve a relaxed casual look with a modern take, try teaming a grey long sleeve t-shirt with grey plaid chinos. You could follow a more classic route when it comes to footwear by rounding off with boat shoes. So if it's a hot warm weather day and you want to look seriously stylish without putting in too much work, this outfit will do the job in no time. Those who are curious how to dress fashionably as you move into your 30s, you have your answer.