To create a relaxed casual menswear style with a clear fashion twist, you can easily go for a charcoal crew-neck t-shirt and dark green chinos. Our favorite of a ton of ways to round off this outfit is with a pair of sandals. As you can see, this combination is a really good choice, especially for summer-to-fall weather, when the temperature is dipping. This combo shows how 30-year-old gents wow in the fashion department.