A lantern sleeve is a full sleeve with a fitted wrist. The fullness increases at the bottom of the sleeve creating a pretty lantern silhouette. It’s Always Autumn has a free sewing pattern you can use to sew a women’s lantern sleeve sweater. The free pattern comes in a women’s size Large. If you need another size you could probably adapt a regular sleeve pattern using her pattern shape as a guide. Go to It’s Always Autumn for the free pattern and sewing tutorial.
[photo from It’s Always Autumn]