In the Japanese denim scene, FDMTL (Fundamental) has skillfully blended "traditional craftsmanship × modern design" to establish its unique style. Today, we introduce the classic denim pants from the 25SS (Spring/Summer) season, now available at our store.

Based on FDMTL's signature sashiko stitching and patchwork techniques, these pants feature natural fading and damage effects that make them look like they’ve been worn for years. Their beautiful finish has attracted many fans, with particular attention on the Classic Straight model, which adopts a timeless silhouette.

This time, we’ve lined up three variations with different fading, patchwork, and damage effects.

CS121: A design centered around patchwork of various sizes
CS123: A model with heavy damage effects throughout, accented by repairs
CS125: A balanced fusion of patchwork and damage effects

Each model combines vintage charm with innovative modern design, offering both "depth" and "freshness" in one piece.
In this article, we’ll first delve into the silhouette unique to the Classic Straight, followed by a detailed look at the design, details, craftsmanship, materials, and styling points of the three models.

Three types of classic denim pants with different color fading, patchwork, and damage treatment

The reason FDMTL denim captivates so many fans lies in its fusion of "traditional Japanese craftsmanship × modern design." By boldly incorporating techniques such as patchwork and sashiko stitching, FDMTL infuses denim with the depth and artistry of an art piece.

The brand elevates the long-standing Japanese philosophy of "cherishing and reusing fabric" into fashion through its unique patchwork and sashiko ideas. While these details may appear decorative at first glance, they also serve a functional purpose—reinforcing and repairing damaged areas.

By combining multiple fabrics and tones to create contrast, FDMTL injects rhythm into the typically uniform look of denim, resulting in truly one-of-a-kind pieces that define the brand’s distinct identity.

Design variation（CS121 / CS123 / CS125）

(1) CS121：Royal patchwork style
【Design】
A striking pair of denim featuring an array of patchwork panels of various sizes sewn together on both the front and back. With a rich variety of patches, each section showcases unique fading and textures. Some patches are adorned with sashiko-style stitching, adding a handcrafted warmth to the design.

【Texture】
Crafted from Okayama-made selvedge denim as its base, each section varies in thickness and fading, creating a multi-dimensional aesthetic. Many areas exhibit significant fading, enhancing the strong vintage-inspired appeal.

【Features】
An impactful piece that truly embodies the phrase "FDMTL is synonymous with patchwork." Perfect for those who appreciate bold, artistic, and unique fashion statements.

(2) CS123：Emphasizing Distressed Repair Details
【Design】
Featuring extensive distressing, this piece showcases numerous rips and abrasions throughout. Reinforced with patchwork and stitching, the damaged areas serve as both structural reinforcements and striking design accents. The distressing on the thighs is particularly prominent, while the worn-in details extend to the pockets and hems, enhancing its vintage appeal.

【Fabric】
Due to the heavy distressing, some areas of the fabric have become thinner and softer, contributing to a well-worn texture. Despite this, the piece retains the durability characteristic of selvedge denim, while meticulously replicating an authentic "lived-in" feel.

【Features】
A model that exemplifies strong vintage aesthetics and exceptional craftsmanship in distressing techniques. Perfect for those who appreciate a rock-inspired or streetwear look.

(3) CS125：A Perfect Fusion of Patchwork and Distressed Detailing
【Design】
While not as heavily patchworked as the CS121, this piece strategically places large, bold patches for a striking effect. Subtle distressing adds to its artistic appeal, giving the denim a more expressive and dynamic look. A standout feature is the oversized patch on the thigh, complemented by subtle white paint-like stains that enhance the rugged aesthetic.

【Fabric】
Crafted from selvedge denim, the fabric exhibits varying levels of fading in different areas. Compared to the CS121 and CS123, this model retains a stronger contrast between deep indigo and faded areas, creating a visually engaging interplay of tones.

【Features】
A well-balanced fusion of patchwork and distressing, offering just the right amount of individuality. This piece seamlessly blends the ruggedness of workwear with the refined artistry of modern design, making it a versatile statement piece.

The details that have been carefully selected

The details of the Classic Straight Denim (CS) combine a deep understanding of vintage with FDMTL's signature playfulness.
While incorporating details reminiscent of vintage denim, modern elements and unique touches are added, creating a one-of-a-kind presence.

Hidden Rivets
Faithful to pre-1960s originals, the rivet heads are hidden on the inside to prevent damage to skin or other clothing. While the exterior appears simple, this detail requires meticulous craftsmanship. Additionally, hiding the rivets slightly stretches the fabric, creating subtle variations in fading over time.

Button Fly
A rugged detail from before zippers became mainstream, offering durability. Repeated use of the button fly creates wear around the buttonholes, adding a three-dimensional fading effect.

Keyholder Loop (Left Pocket Opening)
A functional detail derived from workwear. Historically used to hang pocket watches or keys, it now serves as a fashionable accent.

Charm Bell Under the Belt Loop
A small, removable bell adds a subtle presence. The faint sound it makes while walking enhances the feeling of "growing" your denim, a unique touch from FDMTL.

Masterful Stitching
Triple stitching and chain stitching, reminiscent of vintage techniques, are carefully reproduced. Additional stitching on patchwork or repair areas sometimes uses intentionally noticeable thread, blending seamlessly into the design.

Other Detailed Touches
The shape and angle of the back pockets, chain-stitched hems, and other details are designed to create subtle wear over time. Long-term wear results in unique aging effects.

These diverse details come together to create FDMTL's Classic Straight, which pursues both functionality and design. Respecting the craftsmanship and DNA of classic workwear while introducing a "newness" that fits modern fashion is what continues to captivate fans.

Silhouette

Classic Straight Look Features

The FDMTL Classic Straight is based on the timeless straight-leg silhouette of vintage denim while incorporating a slight taper in key areas. This design allows for a relaxed fit around the hips and thighs, while the lower leg maintains a streamlined appearance. As a result, it offers a slightly looser take on the Levi’s 501, yet avoids any sense of bulkiness.

With a comfortable fit around the waist and thighs, these jeans provide ease of movement, making them ideal for long hours of wear or active lifestyles. Free from fleeting trends, they are highly regarded as a “timeless staple” that can be worn for years to come.

Model image and versatility

When worn, the silhouette allows for just the right amount of space around the legs, preventing discomfort in hot seasons and making it easy to layer thermal wear in colder months. This versatile fit ensures all-season wearability.

Whether paired casually with a simple T-shirt or styled more elegantly with a shirt or jacket, these jeans adapt seamlessly from streetwear to refined looks. Its timeless design ensures compatibility with any top or footwear, making it a versatile wardrobe essential.

Masterful Craftsmanship for Natural Aging

The Secret Behind Its Natural Fading

FDMTL denim employs a variety of techniques such as stone washing and blasting to achieve the perfect fade and texture. However, instead of relying entirely on machinery, skilled artisans meticulously assess and adjust each pair individually, ensuring a uniquely refined finish.

In models like the A-type (CS121), where extensive patchwork is used, each patch must be faded differently while maintaining overall harmony. This requires an incredibly delicate touch, and this dedication is the key to achieving an authentic yet one-of-a-kind vintage aesthetic.

The Art of Damage & Repair Processing

In heavily distressed models like CS123, damage is not merely about creating holes; reinforcement through fabric patches and stitching transforms them into intentional design elements. Each repair section features subtle variations in stitching, adding a handcrafted warmth to the piece.

Meanwhile, models like CS125, which combine patchwork with distressing, are designed to evolve with wear. As the denim ages, the contrast between patches becomes more pronounced, and distressed areas soften and develop a more lived-in feel over time.

Balancing a Worn-In Look with Modern Appeal

What sets FDMTL apart is its ability to maintain a "used" aesthetic while incorporating modern and fresh design elements. By blending handcrafted details such as patchwork and sashiko stitching with contemporary silhouettes, FDMTL masterfully creates a striking balance between tradition and innovation.

Uncompromising Quality in Materials and Dyeing

FDMTL's denim undergoes various processes like stone washing and blasting to achieve the perfect fading and texture. However, the key feature is that skilled artisans meticulously adjust each pair individually, rather than relying entirely on machines.

For models like Type A (CS121), which heavily feature patchwork, each patch must fade differently while maintaining a cohesive look, requiring extremely delicate work. This attention to detail is the secret to achieving a natural yet unique vintage feel.

The Art of Damage and Repair

For models like CS123, which feature extensive damage, the process goes beyond simply creating holes. Reinforcement with patches and stitching transforms these areas into design elements. The subtle variations in repair stitching add an analog warmth that’s truly captivating.

Models like CS125, which combine patchwork and damage, are designed to develop even more character over time. The non-uniform processing means that as you wear them, the contrast between patches becomes more pronounced, and the damaged areas soften and mature beautifully.

Balancing Vintage and Modernity

FDMTL's charm lies in its ability to balance a vintage, worn-in feel with a modern and fresh design. By incorporating craft-inspired details like patchwork and sashiko while maintaining a modern silhouette, the brand skillfully leverages this contrast to its advantage.

High-Quality Materials and Dyeing with Meticulous Care

Although labeled as new arrivals for the 25SS season, denim is inherently versatile for all seasons. In spring and summer, pair it with lightweight outfits like T-shirts or summer knits, while in fall and winter, layer it with jackets or coats to create seasonal looks without compromising the denim's character.

The Classic Straight's basic silhouette makes it compatible with any top or footwear. For example, pair the heavily patched CS121 with streetwear, the damage-focused CS123 with rock or grunge styles, or the balanced CS125 for a mix of casual and refined looks. Each model offers a unique styling experience.

The Joy of Growing Your Denim Over Time

Even with patchwork and damage details, FDMTL denim evolves with wear, developing even more character. The way the threads fray and wrinkles form allows you to create a truly unique pair, a key reason why so many fans are captivated.

Above is a comprehensive overview of the appeal of FDMTL's Classic Straight Denim (25SS season, 3 models), from introduction to styling.
Each model is a masterpiece of craftsmanship and unique design, guaranteed to captivate you once you try them on.
Be sure to experience them in person and discover your own styling and aging journey.

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  FDMTL CLASSIC STRAIGHT DENIM CS121 （Indigo） $‌389.00
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  FDMTL CLASSIC STRAIGHT DENIM CS123 （Indigo） $‌412.00
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  FDMTL CLASSIC STRAIGHT DENIM CS125 （Indigo） $‌373.00