For a casual and cool ensemble, go for a white and black horizontal striped crew-neck t-shirt and black skinny jeans — these items play really well together. Let your styling skills really shine by complementing your outfit with a pair of black athletic shoes. When you're having one of those bleak fall days, sometimes only a neat look like this one can cheer it up. Laid-back looks for 30-year-old gentlemen aren't actually that hard, as you see here.