Such staples as a navy check blazer and a light blue vertical striped long sleeve shirt are the ideal way to inject some rugged sophistication into your day-to-day casual arsenal. Feeling creative? Jazz up this look by slipping into a pair of dark brown leather loafers. Needless to say, you're looking at a savvy option for a warm hot weather day. This is a stylish yet age-appropriate combo for gentlemen in their thirties.