If you find that when you make or wear trousers, they wrinkle up at the bottom of the back thigh around the knee then it could be that you need more room for your calves.
This is common if you have more athletic calves or if your calves curve out more at the back of the leg.
This video covers how to modify the back of a trouser pattern for a better fit in the lower leg - full calf adjustment.
The weight in this area can be distributed in different ways so depending on your particular body shape this session gives you a few options to consider and different choices of adjustment that you could try.
In this Tuesday Techniques session I explain
how to assess your body to see if this is an adjustment you might need
how to make the pattern adjustments on your pattern piece
other options for pattern adjustments to compliment this modification
If you have a pattern that you want to work on then why not give these modifications a try as you watch the video.
If you want to find out more about how to make a toile then check out this post: What is a toile and why do I need one?
If you have a pattern that is not a simple pair of trousers like the ones in these examples and would like pointers on how to apply this change to that specific pattern please let me know either in the Facebook Group or by email and I can share some tips and techniques to help you tweak this process for your garment.
If you have any questions then I love to help so email me at firstname.lastname@example.org and if you have any a-has or inspiration from this session let me know in the comments below.