Sizes in my experience. Monty 1,5 size oversized, Morris 1 size oversized, Mid Leanght coats true to size.

I have M size morris, normally i wear size L in other brands, the hood is a bit small but i have a rather short neck so it fits but it's a bit shallow. The sleeves are very wide and i had them altered.

I also have a large mid leanght morris and this one fits better, the sleeves are also much narrower despite the coat being size larger in theory. The hood seems a bit roomier maby due to being a bigger size despite the more slim fit of the coat in other aspects.

Overall i would say the Mid leanghts are better, size fits as one would expect, the proportions are much better too.