If you need to make simple length adjustments to your paper sewing patterns. Then follow these simple tips, using the following diagrams, and you can adjust your patterns exactly the length you need to.
Most commercial standard ladies patterns are made for an average height between 167cm (5´6″) to 173cm (5´8″).
If you are outside this range, you will probably need to adjust the pattern.
The first measurement needed is your back length, from the nape of the neck along the spine to your waist. Shown in this diagram marked in Purple.
Compare your back length to the sewing pattern, allowing for different necklines. Use a body sloper (block) pattern as your go-to template. This will help with getting the best results out of every pattern.