I have been a professional for a long time, and of all the books I have ever read on gentlemen's fashion and appearance, this book by Clinton Greenleaf III is by far the most comprehensive, informative and practical guide that I have come across. He writes in detail on the important aspects of dressing, handshaking, and general behavior and doesn't waste your time. The book is short and sweet, and to the point-- I first read it while on a business flight. This is by all means a MUST HAVE for any professional-- my copy is in my briefcase and it goes where I go.