A. The Shoulders - Always look for a crisp silhouette. The result is a naturally draped shoulder that is easy to throw on.

B. The Lapels - Your flat hand should slide comfortably between the lapel area and your shirt when your jacket is buttoned.

C. The Buttons - The top button of a two-button blazer should hit more than a bit above the navel (and never, ever, ever below the navel).

D. The Sleeves - The sleeves should hit between your first thumb joint and your wrist. And, as with all jackets, make sure to get them tailored so a quarter to a half-inch of shirt cuff falls below your jacket. Otherwise you'll have overly long giraffe arms.

E. Unlined Interior - When you take away the lining, you’ve got a blazer that is more breathable and stays cooler in the sun.