| I wanted to make a coat out of a TNT pattern I have used many times. I have always just lengthened the jacket previous to this, but for a more substantial coat, I wanted to do it right. I posted the question on the boards and someone mentioned that Threads Magazine had printed the "magic formula" for fitting ease of a coat from a jacket pattern. I will not copy the diagram here, as Threads has the copyright, of course, but I can give the basics--they really helped.
You should probably trace out your pattern so you can use the jacket pattern as a jacket. On the traced-out pattern add the length you want and then you will:
1. Lower the neck 1/8"
2. Raise the end of the shoulder to allow for desired shoulder pad
3. Extend the shoulder 1/2 "
4. Lower the underarm 1/2"
5. Add 1/2" to the sides
These tiny adjustments made the pattern perfect as a coat.