Levi's 506XX Type I: The Genesis of the Denim Jacket, Its Journey from 1936 to 1953

Levi’s 506XX Type I: The Genesis of the Denim Jacket, Its Journey from 1936 to 1953

When discussing the history of denim jackets, the Levi’s 506XX Type I is an unavoidable and foundational garment. Produced from 1936, when the Red Tab was added, until the introduction of its successor, the Type II, in 1953, this model has profoundly influenced workwear and fashion thereafter. As a denim historian, this article will delve into how the 506XX Type I was born, evolved, and has maintained its value to this day, tracing its trajectory from 1936 to 1953.

1. Introduction — Why This Item is Culturally Significant

The Levi’s 506XX Type I jacket has established itself as a cultural icon, transcending its origins as mere workwear. Its robust construction and practical design were widely favored by the working class in early 20th-century America. Over time, its functional beauty and rugged appearance came to symbolize defiance and freedom through popular culture, including film and music. This jacket represents a crucial milestone in the transition of workwear into a fashion item.

2. Historical Background — Year of Origin and Brand Context

Levi Strauss & Co. began releasing denim tops under the name “Blouse” around 1905. However, the model with the established design that we recognize today as the “Type I” officially emerged in 1936. This was the year Levi’s first adopted its iconic Red Tab for this denim jacket.

The “XX” designation was a symbol of Levi’s high-quality denim fabric used in its workwear, typically 14-ounce denim. The lot number “506” served to identify this denim jacket. Therefore, the designation 506XX implied “Levi’s work jacket made from high-quality 14-ounce denim.”

3. Construction Details — Selvedge, Hardware, Stitching, Silhouette

The appeal of the 506XX Type I jacket lies in its intricate details.

• Selvedge: Denim fabric of that era was woven on old shuttle looms, and the edges were finished with selvedge (red ear) to prevent fraying. The Type I jacket utilized this selvedge, which is highly valued by modern denim enthusiasts as a testament to its rarity and craftsmanship.
• Hardware: The front buttons were metal shank buttons engraved with the Levi’s logo, referred to as the “button-front closure,” responsible for fastening the jacket. Additionally, the flap pocket on the left chest is a characteristic feature of the Type I. The pocket itself was present on the left chest from the earliest version (1905); the flap was added around 1928. (Heddels, Long John)
• Stitching and Pleats: The front of the jacket features double knife pleats, created by folding the fabric twice. This not only enhanced the fabric’s durability but also produced a distinctive three-dimensional effect. These pleats were secured with box stitching, adding to the design’s accent.
• Silhouette: The Type I jacket has a relatively boxy silhouette, offering a looser fit compared to the tighter styles of today. This relaxed fit was designed for ease of movement during work.
• Back Details: The back of the jacket is equipped with a reversible cinch strap. This belt, featuring a metal buckle, was used to adjust the fit of the waist. (Levi Strauss & Co. Archives)

4. Authenticity and Age Identification (Vintage vs. Replica)

Several points are key to distinguishing vintage Type I jackets:

• Red Tab: Models from 1936 onwards feature a Red Tab with the large “LEVI’S” logo, known as the “Big E.” However, there are exceptions, particularly for wartime models.
• Pockets: While the Type I primarily has one flap pocket on the left chest, specifications can vary by era.
• Buttons: The engraving, shape, and material of the buttons also show changes over time.
• Stitching and Pleats: Details such as how the pleats are fastened and the placement of stitching indicate era-specific characteristics.
• Fabric: The type of denim weave (Right-Hand Twill - RHT), indigo rope dyeing, and the texture of the ring-spun yarn are also clues for identifying vintage pieces. (Levi Strauss & Co. Archives, Heddels)

Replica brands strive to reproduce these details faithfully, but the unique character and aging that come with years of wear are only achievable with vintage items that have been worn over a long period.

5. Simplification During Wartime: S506XX (1944-1945)

During World War II, material shortages affected many products, and Levi’s was no exception. From around 1944 to 1945, due to rationing-driven simplifications, the specifications of the Type I jacket were streamlined. This model is known as the “S506XX,” where “S” stands for “Simplified.”

Key simplifications included:

• Buttons: Standard metal shank buttons were replaced with unengraved donut metal buttons.
• Back Cinch Strap: The metal hardware on the buckle was simplified. However, the cinch strap itself was not removed during the war. (Levi Strauss & Co. Archives)

These specification changes were temporary measures during wartime, but the S506XX is highly valued by collectors due to its rarity and historical context.

6. Appearances by Celebrities and Cultural Moments

While there is no definitive research data on specific film appearances or notable celebrity wearings directly featuring the Type I jacket, in the 1950s, Levi’s jeans became widely recognized as a symbol of youth culture and rebellion after being worn by Marlon Brando in “The Wild One.” This iconic status of the jeans also extended to the jacket, elevating its presence not just as workwear but also as a fashion item. In the context of that era, the Type I jacket became an item symbolizing a cool and tough image.

7. Current Acquisition Sources (Vintage Market & Replica Brands)

Today, original 506XX Type I jackets are primarily found in the vintage market. They can be sought on platforms like eBay and at vintage clothing stores both domestically and internationally. Depending on the condition, size, and era (especially pre-Red Tab models or S506XX), they can command very high prices.

On the other hand, numerous replica brands offer models that faithfully reproduce the original details. These are attractive options for those who wish to enjoy the original atmosphere conveniently or who want to experience the aging process from a new condition.

8. Conclusion

The Levi’s 506XX Type I jacket, refined in design and practicality within the limited period of 1936 to 1953, established the prototype for modern denim jackets. Through its evolution, including the introduction of the Red Tab, the addition of flap pockets, and wartime simplifications, its design progressed.

In 1953, the baton was passed to the Type II (507XX), which featured different characteristics, such as the removal of the cinch strap and the adoption of symmetrical twin chest pockets. The double knife pleats of the Type I were secured with bar tacks in the Type II, marking a shift in design direction.

The material choices of the 506XX Type I jacket—such as its Right-Hand Twill (RHT) selvedge denim, indigo rope dyeing, and ring-spun yarn—along with its construction that harmonized practicality and design, continue to be valued by many enthusiasts even after more than half a century. It transcends the realm of mere clothing, serving as a significant witness to American labor culture and fashion history, a value that will never diminish.