Such must-haves as a blue mock-neck sweater and a crew-neck t-shirt are the ideal way to introduce some masculine sophistication into your day-to-day casual fashion mix. Serve a little outfit-mixing magic by slipping into violet athletic shoes. And if you're looking for a neat ensemble that will take you from winter to spring, this one fits the task well. Dressing inspo like this will help you remain incredibly fashionable while going into your 30s.