Consider wearing a tan turtleneck and black skinny jeans if you're hunting for a look idea for when you want to look casually cool. Our favorite of an endless number of ways to complete this look is a pair of white leather low top sneakers. So as you can see, it's a neat, not to mention spring-friendly, getup to have in your transeasonal sartorial collection. Those wondering how to wear cool casual outfits in your early 20s, you have your answer.