What is peplum?
Peplum (or peplum) is a wide frill, flounce, or flared strip of fabric sewn along the waistline of a blouse, jacket, skirt, or dress.

In modern fashion dictionaries, the answer to the question of what a peplum on a blouse is is identical to the term "peplum." Historically, the word "peplum" comes from the ancient Greek women's garment (peplos), and "peplum" comes from an element of the traditional Basque national costume.
The main design feature of this piece is to accentuate the waist and visually widen the hips. This cut creates a classic hourglass silhouette.
The piece can be cut on the bias to create soft, falling folds, pleated, or given a rigid, architectural shape through the use of heavy fabrics.
Main types
Classic (flared) The peplum is cut in a half- or full-sun shape. It creates soft, natural waves at the hips and seamlessly accentuates the figure's curves.
Architectural The design is created by folding the fabric into rigid inverted or box pleats. This technique creates a strict geometric volume and is often used on jackets made of suiting wool or heavy cotton.

Asymmetrical The peplum has varying hem lengths. It can be shorter in the front and longer in the back, or slanted to one side, adding a dynamic touch.
Removable (basque-belt) A stand-alone accessory in the form of a wide belt with an attached frill. This detail is worn over basic clothing, such as oversized shirts or sheath dresses.

What to combine with
Peplum blouses and jackets pair well with slim or straight bottoms. Pencil skirts, tapered suits, or straight-leg jeans are ideal choices.
To maintain proper proportions, avoid pairing peplums with voluminous bottoms. Palazzo pants, A-line skirts, or full maxis will add weight to the silhouette and disrupt the volume balance.

When choosing outerwear over a peplum jacket or blouse, consider cropped, waist-length jackets. Straight coats and loose-fitting trench coats that don't bunch up the voluminous detail at the hips are also suitable.
Removable peplums made of dense materials like leather or suede are worn over smooth textures. They complement basic turtlenecks, long shirts, or fitted knit dresses.