Pretty much this x10000000
I agree that mid-length coats can be tricky, especially when they're cut kinda blousy / a-line like this season's Schneider. The effect of most coats of this length is that of a really structured oversized suit jacket. Peacoats are a prime example of this - Big barrel of a torso, waddly penguin arms, often exacerbated by stick legs and the seemingly huuge boots sticking out the bottom.
Buuut, if your swagger is strong, you can get away with a lot of silhouette weirdness.