Fashionable and comfortable, this casual pairing of a grey crew-neck sweater and navy jeans provides with amazing styling possibilities. And if you need to easily dial down your outfit with one single item, complement your ensemble with a pair of beige print canvas sandals. Clearly, it's easier to work through a warm summer day in a cool combo such as this one. Guys wondering how to dress with style as you go into your 30s, you have your answer.