I'm a professional corsetiere and pattern maker and needed tips on fitting trousers (baggy smile lines at the front) and a really difficult 'shoulder rotation' client problem. I got this and copies of Pants for Real People: Fit and Sew for Any Body by Pati Palmer and Marta Alto and Fit for Real People: Sew Great Clothes Using ANY Pattern (Sewing for Real People) by Pati Palmer, Marta Alto, and Jeannette Schilling. The two other books have solved the problem first time, with brilliant photos and spotted the problem, first time bang on. However, Fast Fit offered incorrect fitting advice (slash and spread the front crotch seam, instead of the correct add height to the front middle crotch seam), with not enough detail and only the most basic of fitting problems covered by line drawings. As a result I have returned my copy and I would urge you to invest the the two books from Palmer Pletch that I have mentioned above. They are so good I've since bought their Couture Sewing, and Bridal Couture books, both of which are brilliant. In short do not buy this book, Pants/Fit for Real People will be of much more use.