I was wondering if anyone was answering these questions. I bought a pattern that said size 6-8-10 on the cover. Body measurements were not listed on the back, the chart was inside the package. I wear size 8 and the chart says I am size 16. I was looking for information on how to alter the pattern to make it size 16. I found these posts with the same question and I was surprised to see that the finished project was always huge and needed to be cut down. My pattern states that 1.5cm seam allowance is built into the pattern. So before I adjust the pattern I laid it out and measured the waist because there was an obvious waist line on every piece. It is exactly 12cm longer than my waist measurement. (4 pieces x 1.5cm is 12cm) So if I cut out the pattern right on the edge without seam allowance it is exactly the right size I need. I don't have to adjust the pattern to be size 16 after all. Maybe this will help someone.