If there is a more thorough, yet succinct, book for women on developing personal style, I haven't found it. Amanda Brooks's I Love Your Style: How to Define and Refine Your Personal Style gets down to brass tacks in a hurry. As a Palm Beach native, her expertise on classic style is particularly insightful. The section devoted to it is spot on. So spot on, in fact, I found it largely applicable to men too.
"In this wonderfully wise book, Amanda Brooks reveals the style secrets of unexpectedly elegant, singular women from all walks of life. It's candid, canny, and cool, much like Brooks herself."
Editor in Chief, Vogue