Consider wearing a navy long sleeve shirt and white and navy horizontal striped shorts to put together a casually stylish look. White athletic shoes introduce a more laid-back aesthetic to the getup. So if it's a super hot warm weather afternoon and you want to look seriously stylish without putting too much effort, this outfit will do the job in no time flat. This pairing demonstrates that as a 30-something Millennial guy, you have a vast array of styling options.