Such essentials as a yellow knit blazer and chinos are the perfect way to inject a dash of manly elegance into your day-to-day fashion mix. For something more on the casually cool side to finish your getup, enter a pair of white and purple athletic shoes into the equation. Needless to say, you're looking at a nice option for a blazing hot warm weather afternoon. Wondering how to master casual style as you turn 30? This combination is a practical illustration.