Ah, you're talking about pullovers, they don't have an open in the front.
I meanly wear pull over ,you know the one without buttons that one can pull over the head. Hence the name pull over
I love cardigans and all types of sweaters. But right now it's summer and I can't layer that much. I see, so you like garments that covers your arms and torso? Yeah, I also like how a lot of sweaters these days have zippers so it's easy to take them off. You know of those old ones you got to throw over your head right?
By contrast, a pullover does not open in front but must be ''pulled over'' the head to be worn.