The problem that I've found with my jackets are that because the collar to shoulder seam (running along shoulder) sits further back on most people's shoulders (and mine) [meaning it's not running along the shoulder ridge] the shoulder measurement will essentially then be a misrepresentation of how it will fit/look.
ie if a jacket had a shoulder measurement of 19.5 inches it will hang down your back and add an appearance of an extra 1/2-1 inch making the jacket a 20-20.5" shouldered jacket and having the sleeve seam hang further down the the arm.
So the problem is then... do you subtract a 1/2-1 inch in one's shoulder measurement? ie. order a 18.5-19" to get a 19.5"?
Has anyone found the same?
Here is a example of what I mean.
![Image](https://i.imgur.com/6SynHmN.jpg?2)
This screen cap shows the shoulder seam highlighted when the jacket is half zipped up (Raven Bar scene)
![Image](https://i.imgur.com/czHc9xC.jpg)