This combination of a white and purple dress shirt and blue ripped skinny jeans is solid proof that a straightforward casual look doesn't have to be boring. Complement this look with tassel loafers for an extra touch of style. You'll always look stylish even despite the oppressive heat if you keep this getup as a last-minute grab. When it comes to casual fashion tips for gentlemen in their 30s, this getup looks cool on almost anyone.