Haute couture's most celebrated pleats divide into two families: the flat, uniform folds of accordion and crystal pleating, produced by pressing silk between pre-pleated cardboard molds, and the dimensional, irregular pleats of Mariano Fortuny, whose exact method remains a subject of historical debate. The Metropolitan Museum of Art's Costume Institute, which has conserved Fortuny's work, distinguishes his pleats sharply from flat accordion, box, and knife styles: Fortuny pleats stand out from the fabric rather than lying against it, and no two are exactly the same, even within a single dress.
The Art of Haute Couture Pleating: An Introduction
Pleating is among the oldest fabric manipulations, and its expressive possibilities have expanded with each technological innovation in textiles. As the textile designer Floriane Schmitt explains in her guide to pleating, pleats do more than decorate: they add volume, make textiles behave as if elastic, create freedom of movement in clothes, and lend texture to any fabric. In haute couture, pleating can be a supporting detail or the entire architecture of a garment.
The craft divides by production method. Machine pleating produces regular patterns—accordion, side, and sunburst among them—at scale, and it is the process behind Issey Miyake's well-known pleated clothing, which Schmitt describes as sewn first at three times the final size and then pleated down to the finished garment. Cardboard pleating, by contrast, is completely handmade and reserved for haute couture garments or small-scale production. The fabric is placed between two pieces of cardboard or kraft paper that are already pleated; pressing the sandwich transfers the pleat's shape to the cloth, and heat or steam fixes it in place. Schmitt notes that a few companies, including Lognon and Ciment Pleating, still practice this method, and that the resulting "fancy pleats" can be far more intricate than machine patterns.
Fortuny Pleating: The Enduring Mystery of the Delphos Gown
Fortuny pleating is the singular case among couture pleats because its full process was never publicly documented. Mariano Fortuny (1871–1949), a painter and inventor who also designed an innovative system of indirect theatrical lighting, filed a patent in 1909 to protect the pleating technique—and, as the Costume Institute's conservation notes record, the patent itself credits Adèle Nigrin as the method's inventor. He then produced essentially the same pleated silk garment, with slight variations, from 1909 to 1949, an approach so outside the fashion cycle that the ASU FIDM Museum considers him less a couturier than an artist who made clothing.
The signature garment is the Delphos gown, and its pleats are unlike any other technique. The Costume Institute describes them as dimensional and irregular, exceptionally small—sometimes just one-eighth of an inch—and standing out from the fabric rather than lying flat, which allows the silk to stretch over the body. A gentle horizontal wave crosses the pleating, producing an organic effect, as if the dress were a cascade of hair or flowing water.
What is known of the method is fragmentary. According to the ASU FIDM Museum, the only surviving evidence of the process is an image from a patent application for a machine used in some part of it, and scholars have suggested that the pleated widths of fabric were held in place by thread during heat-setting. Each panel contained between 430 and 450 pleats and was hand-sewn after pleating. Even so stable a pleat required care: customers were encouraged to store their Fortuny garments twisted into coils inside small, round hat-boxes, a practice that helped the pleats hold their form.
Accordion and Crystal Pleating: Crafting Structured Elegance
Accordion pleating is the most recognizable of the structured pleats: uniform, flat, parallel folds that resemble the bellows of an accordion, lying flat against the fabric. It is produced by the pressing method described above—fabric, most often silk, placed between pre-pleated cardboard or kraft paper and pressed, with heat or steam fixing the fold—and it can also be made by machine, which suits its regular geometry.
Crystal pleating shares the same underlying craft: silk placed between pleated cardboard molds and pressed into shape. The distinction from accordion pleating lies primarily in the size and density of the pleats. Crystal pleats are very fine and tightly packed, creating a delicate, shimmering texture on silk; Schmitt records that they are also known as Mushroom or Jewellery pleats. Where accordion pleats read as crisp, architectural bands, crystal pleats read as a near-continuous shimmer, the folds so fine that the eye registers texture before it registers structure.
Both techniques belong to the handmade cardboard tradition that haute couture still sustains, and both depend on the same principle: the mold dictates the geometry, and heat makes it permanent. Their regularity is precisely what separates them from Fortuny's work, where uniformity was never the aim.
Comparative Guide to Haute Couture Pleating Techniques
The three techniques can be distinguished along three attributes—how the pleats are made, how they look, and the garment that defines them. The table below draws those contrasts directly, so a reader can move from an observed pleat back to the craft that produced it.
| Technique | Method Summary | Visual Effect | Key Example |
|---|---|---|---|
| Fortuny | Heat-set process, never fully documented; the 1909 patent credits Adèle Nigrin as inventor. Panels of 430–450 pleats were hand-sewn after pleating, and scholars suggest the fabric was held by thread during heat-setting. | Dimensional, irregular pleats, sometimes just one-eighth of an inch, that stand out from the fabric and stretch over the body, with a horizontal wave suggesting flowing water. No two pleats are the same, even within one dress. | The Delphos gown, produced from 1909 to 1949. |
| Accordion | Fabric, typically silk, placed between two pre-pleated pieces of cardboard or kraft paper and pressed; heat or steam fixes the pleat. Also achievable by machine. | Uniform, flat, parallel folds resembling an accordion's bellows; the pleats lie flat against the fabric. | Structured garments with repetitive folds, most famously Issey Miyake's pleated clothing, which is sewn oversized and pleated down to finished size. |
| Crystal | Same pressing method as accordion pleating—silk placed between pleated cardboard molds and pressed. | Very fine, tightly packed pleats creating a delicate, shimmering texture; also known as Mushroom or Jewellery pleats. | Fine silk couture pieces where density of fold, not banding, is the effect. |
Read across the rows, the comparison isolates each technique's signature: Fortuny is defined by irregularity and dimension, accordion by uniform flat folds, and crystal by fineness and density. The method column explains the effect—mold-pressed geometry yields regularity, while Fortuny's undocumented heat-set process yielded pleats that behave like no other.
Appreciating the Craft: Identifying Pleating in Haute Couture
Readers can confidently differentiate between Fortuny, accordion, and crystal pleating by observing the pleat's regularity, dimension, and overall visual texture. Flat, uniform, parallel folds indicate accordion pleating; the same flat construction at a much finer, denser scale, with a shimmering silk surface, indicates crystal pleating; and small, irregular, dimensional pleats that stand out from the fabric and ripple horizontally point to Fortuny. The measurable test of this framework is the ability to correctly identify the pleating technique in images or descriptions of haute couture garments—and the Delphos gown, with its one-eighth-inch pleats and 1909 patent, remains the benchmark against which every other identification is made.
