I got a mackinaw with a hood for Christmas.
The mackinaw is a two piece garment, which I did not realize when it was ordered.
There is a tunic part that is like the pullover shirt with no hood that you put on first. This has sleeves and covers your whole torso just like the shirt. You could wear this alone if you wanted to.
Then separately you put on the hood part, which has a hood and then covers your back, shoulders, and chest down to just below your armpits. It has two arm holes that you put your arms through, but it does not have sleeves.
So you end up with a double layer over your shoulders and upper chest and back, and the sleeves move freely through the arm holes.
I found this ease of movement to be real good for shooting a bow, chopping wood, etc.
I have worn mine with a shirt and vest underneath in a drizzle at 25 degrees. I was only out about an hour and a half and I was walking but I was warm and toasty.
I have a Asbell pullover shirt as well and it is real nice, but I think the mackinaw is warmer due to the double layering. Of course I will wind up wearing both of them if it gets cold enough. Hope that helps you. Walt