peplum means: The Greek word “tunic” for peplum means skirt-like frills or additions. These were originally worn with a doublet or waistcoat, but are now fitted to the bodice of a woman, which extends below the waist. (in Fashion Dictionary)

What else does peplum mean?

In the creation of jackets or blouses, a ruffle (or flared) section that is shorter than the waist. A peplum can be attached to a belt, sewn to the bodice or cut separately. (in Fashion Dictionary)

Attached at the waistline to a blouse, jacket or dress is a short, overskirt, or ruffle. (in Merlin Dictionary)