This is less a pattern book, although the attractive patterns are wonderful for the full-figured body, and more of a how-to book for making alternations to any patterns that you like but that don't necessarily fit you. If you have irregularities in your body shape, and who doesn't, it shows you how you can knit a "medium" sweater back piece together with "large" sweater front pieces by matching up the armholes, or how to decrease from a large hip measurement to an average bust for the basic pear shape. It teaches the math involved in pattern-making, which also makes it possible to take a great pattern intended for Aran yarn and transpose it to fingering weight, based on the number of stitches per inch and rows per inch in your knitted swatch.
You'll need to know your body's dimensions, such as shoulder width, arm length, chest measurement, back length, etc. These numbers can then be plugged into mathmatical formulas cited in the book to determine where and how you'll need to make the needed adjustments to your garment, as well as how to calculate if you'll need more yarn than your initial pattern required and exactly how much more you'll need to buy.
Initially, those of us who are math-impaired might want to shy away from any of this, but as someone who owns other design-your-own books, the formulas contained in this book are a Godsend. I actually had a flash of comprehension for the basic theory behind knitted garment proportions.
I've lifted some of the formulas out of the book so I can xerox sheets for every project I do. This way I simply plug in the numbers and I'm all set to knit a sweater, shell, or jacket that fits well and looks sharp.