Dial up your sartorial game in this combination of a navy suit and a grey long sleeve t-shirt. Why not add black leather derby shoes to the mix for an added dose of style? So if it's a roasting hot summer afternoon and you want to look sharp without putting in too much work, this look will do the job in seconds time. As you're maturing from your 20s to your 30s, you want to start dressing like a grown man. That's when combinations like this are a lifesaver.