Reach for a blazer and a white and blue crew-neck t-shirt for knockout menswear style. On the shoe front, go for something on the laid-back end of the spectrum and round off this look with brown leather low top sneakers. A good illustration of comfortable fashion, this look must be in your front hall closet come winter. When it comes to casual style for 30-year-old gents, this combo is a good look on most men.