Tuesday 11 May 2021: You can find Sarah through her website Sarah Veblen Clothing Originals. On her website you can find a variety of classes taught by Sarah.
Sarah talks about using horizontal balance lines on garments for a better fit. Sarah has written about this in her article about How to make a mock-up.
Making a mock up pants pattern with both the grainlines and horizontal balance lines will help you identify where the pattern needs adjusting for a better fit.
A starting point with grainlines and horizontal balance lines – front view 
Back crotch scoop – dipping hbl means more cb length needed at the base of the CB seam 
Centre back scoop – now balanced hbl with adjustments and waist darts added
The horizontal balance lines (hbl) will show if the centre back seam needs more or less length.
Sarah recommends drawing 3 hbls on the pants mock up. The first across the widest part of your buttock and then two more hbls. One hbl 5 cm above the first hbl and one 5cm below the first hbl.
The grainlines will show where you need more or less fullness. When the grainlines start to angle across the body, that tells you the crotch needs to be scooped! Pinning the crotch curve allows you to see how much scoop is needed to straighten the grainlines.
Changes to the centre back seam can affect the front of the pants.
Sarah talks indepth about crotch lengths required for a good fit and ensure you have the correct proportions.
When Sarah talks about walking a pattern, this is the process of matching up stitching lines of each seam, to determine if the seams will line up correctly when sewn in fabric. You’re checking the seam lines are the same length
In some cases the stitching lines will be exactly the same length, which is straightforward matching: centre front and centre back seams are almost always the same length.
You can find Sarah on her website where her classes are listed with her resources.
Sew organised style podcast 