All the measurements are very accurate for standard body sizes. If your measurements are the same like the belonging size, than you don't have to make alterations. But if your body measurements don't match with any size, than you will need to add or remove cm/inches from the pattern in order to achieve a perfect fit. I always advice to find your matching bust size and then make alterations on the waist. I find it more easy this way. I highly recommend to make a mock up first to check the fitting before cutting the main fabric.
