Combining a navy blazer and a white and green vertical striped long sleeve shirt is a fail-safe way to infuse your day-to-day collection with some masculine elegance. Finishing with white athletic shoes is the simplest way to inject a more relaxed feel into your ensemble. There's no nicer way to brighten up a gloomy autumn day than a seriously stylish look like this one. This ensemble proves that reaching your 30s is no reason to shed casual style altogether.