First post here. Sorry for the bad pics. That's the suit I just got. It's a 36R from Banana Republic. Need some advice on whether the double vents in the back flare out too much?
I wouldn't go with a short--the 38R coat just covers your rear, and the 38S wouldn't do that.
And yes, the sleeves are too long. You should try to show a bit of shirt cuff, but that doesn't mean you have to buy a shorter coat. Just get the coat sleeves shortened. Everyone has his own idea of how much shirt to show, but generally between 1/4" and 1/2"--I'm probably midway at around 3/8".