Knowing how to dress for your particular body shape is key to looking great. Without this knowledge, you might not know which clothing cuts, styles and lengths look best on you, how to wear certain items to suit your body best or how to choose and place accessories to monopolize on the body you've got.
I have a lot of clients who try to tell me that their bodies are just meant to be fat naturally. I then tell them I'm sorry but I do not agree! The bottom line is this: nobody was born to be uncomfortable in their own skin. It took me a long time to make health my goal, not weight loss. And ever since I've started to make that shift I've never been happier with my body.