Edit: Apparently using "belly" and "roll" completely wrong in the below post, please ignore. I haven't seen any kind of thorough breakdown on lapel "belly" outside of a few mentions of 3/2 rolls and a few offhand comments that lapels should never be creased. I have several 2-button suits I recently bought and all are creased along the lapel roll. Few questions: Is there a rule of thumb with respect to flat versus belly? Where one is appropriate and the other is not? Is it a matter of preference? I have seen it said that it is easier to create a flat lapel roll, which makes sense. Is it possible to create a belly on a jacket lapel that was not designed to curve? I'm not too fond of one of my suit jackets and wouldn't mind experimenting on this kind of thing. The jackets are fully canvased and not fused, if that matters.