Step 6: Trim the excess
Once you've pinned this side in place, you might notice you have a little bit of excess collar at the top. This might be a freak of nature or it might be the fact that I hate actually measuring anything. No worries, just cut that side down until it meets the extension at a nice smooth angle. Improv is the name of the game here, as I model my crafting technique mostly after MacGyver.