I bought Cheap Chic when it first came out and it instantly became my fashion bible. My copy fell apart many years ago from constant consultation but the lessons I learned from it about creating one's own style have stayed with me for over 30 years. The principles that made Donna Karan rich and famous with her "Essentials" line - having a few key pieces that one can mix and match - could have come straight out of that book; that idea was the big take-away for me which I still use to this day to keep my wardrobe pared. It makes it so easy to get dressed in the morning!
Two of my favorite photos were the one of Ola Hudson - in her studio, I think - and someone wearing a Spanish shawl wrapped around her hips, standing on a fire escape in NYC and smoking a cigarette. This is also the first place I ever saw Jerry Hall; I remember being amazed by those endless legs!
Wish I could get hold of a copy again. Back in the late 70's it sure didn't cost $58! But it appears to have become a collector's item, and deservedly so.