Marketing would seem to agree with you.....
Since your interested to see though, this is how I fit a larger build:
This man is 6.4 tall and a size 54 chest (thats inches not European sizing)
Now I will admit this is not a perfect jacket, (it is not actually finished yet, you are seeing the forward fitting which is why there are no buttons). but it is clean and has shape.
After this fitting I cleaned up the sleeves and released the front a touch. The jacket is rather short but this is what the client wanted, even so on the whole I think it works. I also made the trousers. I shot this on an iphone 3 outside of the clients apt so its not staged and its not photoshopped or anything. I wanted to put something like this in another thread but since I was called out, I thought I would show you what I could do. I am sure I have done better and I am sure people will find fault and maybe better examples, but in fairness I think these shots do demonstrate that an English style fitted coat can work on a man with a large build.