What Is Pleating? Knife, Box and Sunray Pleats, Explained

Pleating is the craft of folding fabric into regular, pressed creases so that a flat length of cloth gains movement, volume and structure without adding a single seam. It is one of the oldest and most quietly sophisticated techniques in dressmaking, and it is why a pleated palazzo or skirt swings and falls the way it does. This guide explains what pleating is, the three pleats you will meet most often — knife, box and sunray — and why heat-settable pleats are so well suited to resort and occasion wear.

What is pleating?

A pleat is a fold of fabric secured in place, usually at one edge, so that the cloth doubles back on itself. Repeat that fold at even intervals and you have pleating: a way of building three-dimensional volume into a two-dimensional textile. The fullness can be released into soft drape, as in a swishing skirt, or held crisp and architectural, as in a tailored trouser. Crucially, pleating distributes fabric evenly around the body, which is part of why pleated garments are so forgiving and so flattering across a range of shapes.

Pleats are typically formed in one of two ways. Traditional pressed pleats are folded by hand or machine and set with steam and heat. Permanent pleats are set into synthetic or blended fabric using high heat that effectively "remembers" the fold, so the pleats survive washing and wear. The pattern-making resource By Hand London describes pleats simply as folds of fabric used to control fullness — and that control is the whole point: pleating lets a designer add volume exactly where it should fall and nowhere it should not.

Knife, box and sunray pleats explained

Most pleated garments use one of three families of pleat. Knife pleats are the classic: narrow, sharp folds that all face the same direction, like a stack of pages turned one way. They create clean vertical lines and a neat, uniform swing, which is why they appear so often on skirts and on the legs of pleated trousers. Box pleats are formed from two knife pleats turned away from each other, so the fold opens outward into a flat "box" on the surface and meets behind. Box pleats give fuller, more structured volume and a slightly more formal, tailored look — think of the deep folds at the back of a well-made jacket or a structured skirt.

And sunray pleats — sometimes called sunburst pleats — are the most dramatic. The pleats are stitched very fine at the waist and fan out progressively wider toward the hem, so the fabric radiates like the rays of the sun. Sunray pleating produces extraordinary movement and a graceful, fluid fall, which is why it is a favourite for evening skirts and flowing dresses. Each type changes the personality of a garment entirely: knife for crisp and elegant, box for structured and full, sunray for soft drama.

A short history: from Fortuny to Issey Miyake

Pleating has ancient roots — pleated linen appears in Egyptian dress thousands of years ago — but two names define its modern story. The first is Mariano Fortuny, the Venetian designer whose Delphos gown of the early twentieth century used hundreds of impossibly fine vertical pleats in silk to create a column that clung and moved with the body. Fortuny's pleating method was so closely guarded that, as the Victoria and Albert Museum (V&A) in London notes in its costume collection, the exact technique was never fully documented and has never been precisely reproduced. The Delphos turned pleating from a tailoring detail into the entire identity of a garment.

The second is the Japanese designer Issey Miyake. In the late twentieth century, Miyake reversed the traditional order: instead of pleating fabric and then cutting it, he cut and sewed an oversized garment first, then pleated the finished piece by pressing it between heated sheets of paper. The synthetic fabric "remembered" the folds permanently. His Pleats Please line made permanent, machine-washable pleating into wearable, travel-friendly everyday clothing. As fashion-history writing such as The History Reader has chronicled, this lineage — from Fortuny's secret silk to Miyake's engineered permanence — is what made pleating both an art form and a practical, modern technique.

Why heat-set pleats suit resort and occasion wear

For travel and occasion dressing, permanent heat-set pleats are close to ideal. Because the fold is locked into the fabric, the garment resists creasing in transit: you can fold a pleated palazzo into a suitcase and it emerges ready to wear, with no ironing. That alone makes pleating one of the smartest choices in a vacation wardrobe. The pleats also fall fluidly in heat and move beautifully in a breeze, so a pleated piece reads as effortlessly elegant on a resort terrace or at a daytime function.

Pleating also delivers occasion-appropriateness without ornament. A sunray-pleated skirt or a fine knife-pleated co-ord set looks considered and elevated through movement and texture alone — no embroidery or embellishment required — which fits a restrained, quiet-luxury sensibility. And because pleats fall in even vertical lines, they are genuinely flattering across body shapes and sizes, which matters when a single style is offered in sizes XS to 8XL.

Pleated styles and how to wear them

At First Resort, pleating runs across a range of styles, from pleated palazzos and wide-leg trousers to skirts and matching co-ord sets. A pleated palazzo is the most versatile: pair it with a fitted top so the volume of the trouser is balanced by a clean upper line, and the pleats do the styling for you. A pleated skirt — knife or sunray — works the same way, anchored by a tucked-in shirt or a slim knit.

A pleated co-ord set is the easiest route to a polished, head-to-toe look for a sangeet brunch, a resort dinner or a daytime function, while a co-ordinated separate lets you split the pieces across other outfits. The golden rule with pleats is the same as with any strong texture: let them lead. Keep the rest of the outfit simple, choose accessories in a single tone, and avoid layering a second busy element over the movement the pleats already provide.

Caring for pleated clothes

The care a pleated garment needs depends on how the pleats were set. Permanent heat-set pleats in synthetic or blended fabric are the most robust: they can usually be hand-washed gently, hung to drip-dry, and never need ironing — in fact, you should not press them flat, as direct heat can disturb the folds. Pressed pleats in natural fibres such as silk or cotton are more delicate and may need re-pressing or dry cleaning to keep their definition. To store any pleated piece, hang it rather than folding it across the pleat lines, or fold it along the existing folds so the pattern stays intact. Treated this way, good pleating holds its shape for years.

If you are building a travel or occasion wardrobe around pieces that move beautifully and pack flat, start with the vacation edit or browse the latest new arrivals. Free shipping across India.

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