Wouter created the Cornelius cycling breeches pattern based on the Keystone systems. Read more on the FreeSewing blog.
Wouter also shares on the Instagram feed @Wouter.vdub and blogs at ShirtArtistry.
This picture is from Wouter on Discord. It is reposted here with permission.
I'm an IT professional who loves to climb mountains and has discovered the joys of making his own clothes.