Vietto Popper cardigan has poppers on the neckline, under arm, and the matching poppers on the lapel ends for closure. You may attach the poppers many different ways. There’s also thin ribbon inside the cardigan to tighten the cardi and make it fit nicely on the back.
Other lapel has been attached to the under arm inside, other lapel’s been attached to the neckline. The ribbon has been tightened, so the cardi fits nicely on the waist.
You can close the cardigan asymmetrically, in the picture the other lapel’s been attached to the under arm popper inside the cardigan. Other picture shows how the cardigan looks when the ribbon’s been tightened.