Jules does come across wide from shoulder to shoulder in his suit in the beginning scenes. He also is so thin that he could disappear if he turns to the side
I have a sheriff Rick Grimes (Kato's outfit) on an 18 and it reminds me exactly of Jules' build. Wide from shoulder to shoulder but thin throughout.
I think the TTM 18 narrow shoulders is still kinda too wide for Rick. Kato did an excellent job using the BL body.