Thank you for the reply.
Sorry about the image, I have uploaded it to 2 places now, hope one of them works.
I already own a trenchcoat that goes as an overcoat, and it's large enough to fit over a jacket. That's not the purpose of this trenchcoat, it's meant as a 'trendy' coat over shirts and/or light knitwear on days that aren't so cold. This also means that the top button doesn't really need to be fastened.
It is supposed to be slim-fitted. Everything...