Lacoste. The Amazon description of this book calls it, "an encyclopedia of casually elegant style," and it's written by sportswriter Olivier Margot. I don't wear much (any) Lacoste because I don't like how it fits me, but I can certainly appreciate the aesthetic. Not to mention the super-simple book cover.
Fifty Dresses that Changed the World. History + culture + design. It's like this book was written for me.
The Gospel According to Coco Chanel: Life Lessons from the World's Most Elegant Woman. No, I don't know why I haven't read it yet. I feel like I should turn my Deep Glamour card in.