Make a white and black vertical striped long sleeve shirt and grey sweatpants your outfit choice for a laid-back menswear style with an urban take. Grey athletic shoes will bring a dash of stylish casualness to an otherwise mostly classic look. On not-so-chilly afternoons, you can wear this summer-to-fall look and look absolutely awesome. And if we're talking casual fashion tips for guys in their 20s, this look looks cool on most.