This laid-back pairing of a pink short sleeve shirt and shorts can go in different directions depending on how you style it out. When it comes to shoes, go for something on the classier end of the spectrum by slipping into a pair of beige suede desert boots. So if you're looking for an outfit that's sharp but also feels totally spring-ready, this just might be it. When it comes to casual outfit ideas for 30-year-old men, this look looks good on most.