This article is part of The Áo Dài, an ongoing series exploring the history, construction, and cultural significance of Vietnam’s iconic dress.

At first glance, the áo dài appears beautifully simple: a long, graceful tunic worn over trousers. Look more closely, however, and its distinctive character comes from the relationship between several carefully considered elements—the collar, fitted upper body, sleeves, side openings, long front and back panels, trousers, fabric, and precise tailoring.

Together, these elements create a silhouette immediately recognizable as Vietnamese.

The áo dài seen today is also the result of evolution. Its form developed from earlier Vietnamese garments and changed significantly during the twentieth century as Vietnamese designers and tailors introduced new cuts, construction techniques, fabrics, and proportions.

Understanding its anatomy therefore means understanding not only what an áo dài looks like, but how its individual parts work together.

Caption: Figure 1. The basic anatomy of a contemporary áo dài. Designs vary, but the relationship between the long tunic, flowing panels, side openings, and trousers creates its recognizable silhouette.

What Are the Main Parts of an Áo Dài?

A contemporary áo dài generally consists of two main garments: a long tunic (áo) and trousers (quần).

The tunic is typically fitted through the upper body and divided below into two long flowing panels—one in front and one in back. Long openings along the sides separate the panels and allow them to move independently over the trousers.

Although designers continually reinterpret the garment, several features are strongly associated with the classic áo dài silhouette:

• a long tunic
• a fitted upper body
• long front and back panels
• openings along both sides
• trousers worn underneath
• sleeves integrated into the fitted upper portion
• traditionally, a standing collar

Modern áo dài may alter the neckline, sleeves, length, fabric, or proportions, but the relationship between the long tunic and trousers remains one of its most recognizable characteristics.

1. The Collar — Cổ Áo

One of the most familiar features of the classic áo dài is its upright collar.

The collar rises around the neck, giving the upper portion of the garment a structured appearance and visually extending its vertical line. Its exact height and shape vary according to period, designer, occasion, and wearer.

The standing collar, however, is not the only neckline found on an áo dài.

During the twentieth century, designers experimented with numerous variations, including lower collars, collarless designs, rounded necklines, boat necks, and other interpretations.

This illustrates an important characteristic of the áo dài: its identity does not depend upon one collar style alone.

The collar can change while the overall silhouette remains recognizably áo dài.

Caption: Figure 2. Áo dài necklines have changed considerably over time. The standing collar remains iconic, while modern designers have explored many variations.

2. The Fitted Upper Body — Thân Áo

The contrast between a closely tailored upper body and long flowing panels is one of the defining visual qualities of the modern áo dài.

Rather than hanging loosely from the shoulders, the contemporary tunic is generally shaped around the torso. Careful tailoring allows it to follow the wearer's form before opening into the long panels below.

This fitted silhouette was not always characteristic of Vietnamese long robes.

An important transformation occurred during the 1930s, when artist and designer Nguyễn Cát Tường, known professionally as Le Mur, experimented with Vietnamese dress forms and contemporary fashion and tailoring.

His work contributed to a more fitted, fashion-oriented silhouette and introduced new approaches to elements such as necklines, sleeves, color, and construction.

Later generations of Vietnamese tailors continued refining the form.

The modern áo dài should therefore not be understood simply as an ancient garment preserved unchanged through time. It is part of a continuing Vietnamese design tradition.

3. The Sleeves — Tay Áo

Classic áo dài are often made with long, relatively close-fitting sleeves that continue the clean lines of the upper body.

Sleeve construction became particularly important in the development of the modern áo dài.

By the mid-twentieth century, áo dài makers in southern Vietnam were using raglan-style construction, in which a diagonal seam extends from near the neckline toward the underarm rather than following a conventional shoulder seam.

This construction helps create the smooth shoulder and upper-body line associated with many modern áo dài.

Contemporary designers also use short sleeves, three-quarter sleeves, sheer sleeves, flared sleeves, sleeveless designs, and other variations.

Caption: Figure 3. Raglan-style construction uses a diagonal seam extending from the neckline toward the underarm, helping create the smooth shoulder line associated with many modern áo dài.

4. The Front and Back Panels — Tà Áo

Perhaps nothing gives the áo dài its characteristic sense of movement more than its long panels.

The Vietnamese word tà refers to the flowing flap or panel of the garment. A contemporary áo dài typically has:

• Tà trước — front panel
• Tà sau — back panel

Rather than forming a continuous skirt around the legs, the tunic opens along the sides, allowing the front and back panels to move independently over the trousers.

When the wearer walks, the panels respond to each movement.

This creates one of the áo dài's most distinctive visual effects: the upper portion remains relatively structured and close to the body while the lower portion becomes fluid.

Fabric changes this effect dramatically. Lightweight textiles can move softly with the wearer, while brocade and other structured fabrics create a more defined silhouette.

A Note About the Áo Ngũ Thân

The modern two-panel appearance should not simply be projected backward onto earlier Vietnamese garments.

An important predecessor in the áo dài's history is the áo ngũ thân, whose name refers to its five-part construction.

Its structure and silhouette differ from those of the closely fitted modern áo dài.

Understanding this distinction helps us appreciate the modern áo dài as the result of historical evolution rather than as a garment that has remained structurally identical for centuries.

Caption: Figure 4. The front and back tà are separated by long openings along the sides, allowing the panels to move independently over the trousers.

5. The Side Openings — Xẻ Tà

Running between the front and back panels are the áo dài's characteristic side openings, commonly described as side slits.

These openings are fundamental to the garment's construction.

Separating the lower portion into front and back panels allows movement while preserving the long silhouette of the tunic.

The exact height of the openings is not universal. It has changed with fashion, tailoring practices, individual proportions, and contemporary design.

For this reason, it is misleading to describe one particular slit height as the historically "correct" áo dài.

What remains characteristic is the visual relationship between the fitted tunic above and the separated flowing panels below.

6. The Trousers — Quần

The trousers are not simply an accessory worn beneath the áo dài. They are an integral part of the complete ensemble.

The long tunic is worn over trousers rather than as a dress by itself.

Áo dài trousers are generally long and may be cut relatively wide through the leg, creating a flowing lower silhouette that complements the movement of the tunic.

Their width also creates visual balance: the áo dài is fitted through the upper body while the panels and trousers become increasingly fluid below.

Trouser colors have varied according to period, fashion, occasion, and design. White trousers became especially familiar with many women's áo dài, while black, coordinating, contrasting, and brightly colored trousers have also been worn.

Contemporary designers frequently treat the trousers as part of the complete color composition of an áo dài.

Caption: Figure 5. The contrast between the tailored upper body and the movement of the panels and trousers helps create the áo dài's characteristic flowing silhouette.

7. The Fastenings

How an áo dài closes is a small but important part of its construction.

Earlier Vietnamese long garments could use visible buttons or fastenings along the front or side of the body.

Modern áo dài may use small buttons, snaps, hooks, or concealed zippers integrated into the fitted upper portion of the garment.

Contemporary designers often make these functional elements visually discreet.

The objective is to allow the garment to fit closely while preserving a clean, uninterrupted silhouette.

8. Fabric and Drape

The shape of an áo dài cannot be understood separately from its fabric.

Two áo dài made to similar proportions can look remarkably different when constructed from different textiles.

Silk and silk-like fabrics are strongly associated with the garment because of their ability to drape and move gracefully. Brocade produces a richer and more structured appearance and is frequently seen in ceremonial designs.

Velvet, lace, chiffon, organza, embroidered textiles, printed fabrics, and modern blends are also used.

Fabric influences:

• how closely the upper body follows the wearer
• how the sleeves fall
• how the panels move
• how much structure the garment holds
• how embroidery or printed artwork appears

Textile selection is therefore part of the design itself rather than simply decoration added afterward.

9. Tailoring and Proportion

The beauty of an áo dài depends heavily upon proportion.

Custom-made áo dài require careful measurements because relatively small changes can affect the overall silhouette.

A tailor may consider the wearer's shoulders, neck, bust, waist, hips, torso length, arm length, height, tunic length, and trouser length.

The placement of the waist, side openings, collar, sleeves, and panels must work together.

This helps explain why áo dài are closely associated with skilled tailoring.

A successful áo dài is not simply tight clothing. It is shaped clothing.

The goal is to create a continuous and balanced line while allowing the wearer to stand, walk, sit, and move comfortably.

10. How the Anatomy of the Áo Dài Evolved

The áo dài we recognize today did not appear at a single moment in history.

Its development took place gradually.

Earlier Vietnamese Long Robes

Vietnam has a long history of robes and tunics worn with trousers. Earlier garments should be understood in their own historical contexts rather than automatically being labeled as modern áo dài.

Áo Ngũ Thân

During the Nguyễn period, the áo ngũ thân became an important form of Vietnamese dress and represents a significant chapter in the history leading toward the modern áo dài.

Its five-part construction and overall proportions differed noticeably from today's closely fitted áo dài.

1930s — Nguyễn Cát Tường / Le Mur

During the 1930s, Vietnamese artist and designer Nguyễn Cát Tường, known professionally as Le Mur, played an influential role in the development of the modern áo dài.

Trained at the École des Beaux-Arts de l'Indochine (Indochina College of Fine Arts) in Hanoi, Cát Tường approached clothing with an artist's attention to line, proportion, color, and silhouette.

In the March 23, 1934 issue of Phong Hóa, Cát Tường published Y phục của phụ nữ (“Women’s Clothing”), presenting ideas for modernizing Vietnamese women’s dress. His designs moved toward a more closely fitted upper body and experimented with elements such as collars, sleeves, colors, fabrics, and decorative details.

For the anatomy of the áo dài, this transformation was especially significant. The increasingly shaped torso created a stronger contrast between the fitted upper portion and the long, flowing panels below—an important characteristic of the modern áo dài silhouette.

Cát Tường was not solely responsible for the modern áo dài. Vietnamese designers and tailors continued to refine its construction in subsequent decades. His work nevertheless represents an important stage in the transition from earlier Vietnamese long garments toward the streamlined silhouette associated with the modern áo dài.

Mid-Twentieth-Century Refinement

Vietnamese designers and tailors continued experimenting with the garment.

New construction methods, including raglan-style sleeves, contributed to a smoother fit. Necklines, sleeves, waistlines, fabrics, and proportions continued to change during the following decades.

Contemporary Áo Dài

Today's designers have considerable creative freedom.

An áo dài may have a traditional standing collar or no collar at all. Sleeves can be long, short, sheer, embroidered, or dramatically shaped. Panels may feature embroidery, paintings, landscapes, flowers, calligraphy, geometric designs, or contemporary artwork.

Yet the basic visual language remains recognizable: a long Vietnamese tunic with flowing panels worn over trousers.

Figure 6. The modern áo dài developed through successive changes in Vietnamese dress and twentieth-century tailoring. These illustrations show selected milestones in the garment's development and are not intended to represent every style worn during each period.

11. Why the Áo Dài Moves So Beautifully

One of the áo dài's most remarkable characteristics is that its appearance changes when the wearer moves.

Standing still, its long vertical lines create an elongated silhouette.

Walking, the front and back panels separate and move around the trousers.

Lightweight fabric can lift gently with movement, revealing another layer of color beneath.

This contrast—structure above and movement below—is one of the keys to understanding the áo dài's enduring visual appeal.

The garment is not designed to be appreciated only as a static object.

It comes alive when it is worn.

Anatomy at a Glance

More Than the Sum of Its Parts

The anatomy of an áo dài reveals something important about Vietnamese dress.

No single feature defines it.

It is not simply the standing collar. It is not the silk. It is not the fitted waist or the long panels.

It is the relationship between these elements—the tailored upper body, flowing tà áo, side openings, trousers, fabric, proportion, and movement—that creates the distinctive áo dài silhouette.

And that silhouette has never been completely fixed.

Vietnamese designers and tailors have continually adapted the áo dài while maintaining a recognizable connection to what came before.

Perhaps that is one reason the áo dài has endured so successfully.

It carries history without being trapped by it.

It can be traditional and contemporary, restrained and expressive, familiar and continually reinvented.

To understand the anatomy of the áo dài is therefore to see more than the construction of a garment.

It is to see how generations of Vietnamese craftsmanship, creativity, and cultural identity have been shaped into cloth.

Explore more in The Áo Dài series.

Sources & Further Reading

1. Vietnam National Authority of Tourism — “All About Ao Dai: Vietnam’s National Dress”
A useful overview of the áo dài’s historical development, from the áo ngũ thân through twentieth-century transformations and contemporary styles.
Vietnam Tourism — All About Ao Dai

2. Viet Nam News — “Book Exploring Modern Áo Dài Published”
Especially relevant to Nguyễn Cát Tường (Le Mur), including archival research concerning his designs, Phong Hóa No. 90 of March 23, 1934, and the development of the modern áo dài.
Viet Nam News — Book Exploring Modern Áo Dài Published

3. Viet Nam News — “Hoping the Next Generation Will Follow Suit”
Provides useful information about the traditional áo ngũ thân, including its five-part construction and fastenings.
Viet Nam News — Áo Ngũ Thân and Traditional Dress

4. Viet Nam News — “The Secrets of Trạch Xá Village: Mastering the Craft of Long-Dress Making”
Useful for understanding áo dài tailoring and the structural differences between the traditional five-panel garment and later áo dài construction.
Viet Nam News — Trạch Xá Áo Dài Tailoring Tradition

5. Jean-François Hubert — “Nguyễn Cát Tường (Le Mur), 1940: Mother and Child”
A specialist secondary source providing additional context about Cát Tường’s art education, his work with Phong Hóa and Ngày Nay, and his approach to fashion and the áo dài.
Jean-François Hubert — Nguyễn Cát Tường (Le Mur)

Research Note

Historical terminology and áo dài construction vary by period, region, designer, and source. This article therefore avoids treating modern áo dài construction as identical to earlier garments such as the áo ngũ thân and avoids assigning symbolic meanings or specific historical purposes to individual construction features unless those interpretations can be documented.