A denim jacket and a navy and white short sleeve shirt teamed together are a match made in heaven for gentlemen who love casual and cool styles. Add a pair of white canvas low top sneakers to the equation to effortlessly rev up the fashion factor of your outfit. Stick with this one if you're on a mission for a great summertime look. And if we're talking casual fashion tips for gentlemen in their 20s, this look looks great on almost any man.