I like layering. So most Burberry trench coats are not for me because the traditional arm width doesn’t allow to comfortably put something underneath. If you pick the bigger size, it won’t look good.
So I prefer the coat with the dropped-shoulder style like Max Mara that doesn’t have a fixed shoulder line. With the loose cutting, you can easily put it with formal jacket. I remember Burberry trench has this dropped shoulder style. Just FYI and to be considered while checking it out at the boutique.