One big (?) flaw

I’ve made this jacket twice, and I like it, but the collar attachment detail isn’t great. It requires you to cut into the body fabric so that you can flip it down into the button band but up into the collar. It’s a weak joint, and an unattractive finish.

You can see on the red one that it leaves a little gap between the placket and the collar. On the green one, it bugged me so much that I made a little binding to cover it up.

I’m not that experienced with jackets, so I don’t know how to do it better, but it seems to me that it’s the job of a pattern company to figure that out for us, so I’ve lost a little confidence in Friday.