For an outfit that's street-style-worthy and effortlessly sleek, go for a suit and a blue short sleeve shirt. Take an otherwise classic getup down a more casual path by rounding off with a pair of burgundy athletic shoes. We're loving that this combo is ideal when spring sets it. As you're transitioning from your 20s to your 30s, you want to start dressing like an adult. In this case, combinations like this are perfect as inspo.