Iron Heart
402-NAV - Work Shirt - 12oz Ultra Heavy Flannel Navy Chalk Stripe
402-NAV - Work Shirt - 12oz Ultra Heavy Flannel Navy Chalk Stripe
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Description
The Iron Heart IHSH-402-NAV Work Shirt is produced in Japan from a 12 oz. Ultra Heavy Flannel with a double-brushed interior to yield a soft hand in an extremely hardy fabric, in a modern, Wabash-inspired dobby loom Chalk Stripe in navy twill weave to provide a sophisticated palette and pattern. Made from a rare Aspero wild and organic cotton plant found only in the foothills of Northeast Peru, the yarn yields remarkable softness and unmatched strength and has been treasured by the area’s indigenous population for generations. Using the signature Iron Heart Work Shirt pattern, this piece is perfectly proportioned in length to be worn untucked for modern, vintage-styled grit. This Work Shirt has numerous and carefully considered construction and design details, like the squared shoulder and back yoke panel, which is paired with black concave military-grade melamine buttons on the front placket and dual patch front chest pockets with pencil slot, comprising a piece for the stylistically sound and self-reliant. Internal felled seams with chainstitched construction throughout and inseam run-off give this piece all the necessary heritage provenance and then some. The Ultra Heavy Flannel Chalk Stripe Work Shirt strikes a balance between classic and modern applications, making it a future heirloom suitable for endless fall through spring applications. Built for the biker and over-engineered to start, the Iron Heart 402-NAV tests the limits of what can be artfully woven and sewn, delivering a lifetime of durability in a work-ready design.
Specs
- Limited Edition
- Classic Fit
- 12 oz. Japanese Ultra Heavy Weight Flannel
- Proprietary Fabric
- Once Washed
- Single Brushed Face & Double Brushed Interior
- Dobby Woven Wabash Chalk Stripe
- Peruvian Organic Cotton Aspero Yarn
- 100% Cotton
- Point Collar
- Back Yoke Panel
- Buttoned Patch Chest Pockets w/ Pencil Slot
- Yellow Thread Interior Chainstitching
- Buttoned Pleated Cuffs
- Black Melamine Concave Buttons
- Felled Seams
- Chainstitched Construction & Run-off
- Bartack Reinforced
- Made in Japan
Sizing
Model Measurements: 5'9" | 150 lbs. | 38" Chest | 32" Waist - Wearing Size S
Iron Heart Shirting sizing is graded in small increments. The 402-NAV runs true to Iron Heart sizing. This piece is made with a brushed flannel fabric and has been once washed. With regular use, one can expect up to .5” of shrinkage in the chest (Circumference) over the long term.
Our Method of measuring is different than Iron Heart's and we recommend consulting our Sizing Guide when purchasing. We provide garment-specific measurements taken in-house, per Our Method, that are not duplicated across fabric or colorways and are re-measured each production run. Please feel free to Contact Us for additional assistance.
Iron Heart 402-NAV - Work Shirt - 12oz Ultra Heavy Flannel Navy Chalk Stripe

Iron Heart 402-NAV - Work Shirt - 12oz Ultra Heavy Flannel Navy Chalk Stripe
Specs
- Limited Edition
- Classic Fit
- 12 oz. Japanese Ultra Heavy Weight Flannel
- Proprietary Fabric
- Once Washed
- Single Brushed Face & Double Brushed Interior
- Dobby Woven Wabash Chalk Stripe
- Peruvian Organic Cotton Aspero Yarn
- 100% Cotton
- Point Collar
- Back Yoke Panel
- Buttoned Patch Chest Pockets w/ Pencil Slot
- Yellow Thread Interior Chainstitching
- Buttoned Pleated Cuffs
- Black Melamine Concave Buttons
- Felled Seams
- Chainstitched Construction & Run-off
- Bartack Reinforced
- Made in Japan
Sizing
Model Measurements: 5'9" | 150 lbs. | 38" Chest | 32" Waist - Wearing Size S
Iron Heart Shirting sizing is graded in small increments. The 402-NAV runs true to Iron Heart sizing. This piece is made with a brushed flannel fabric and has been once washed. With regular use, one can expect up to .5” of shrinkage in the chest (Circumference) over the long term.
Our Method of measuring is different than Iron Heart's and we recommend consulting our Sizing Guide when purchasing. We provide garment-specific measurements taken in-house, per Our Method, that are not duplicated across fabric or colorways and are re-measured each production run. Please feel free to Contact Us for additional assistance.
Collection: Iron Heart
After 20 years of working in the Japanese garment industry, Shinichi Haraki established Works Inc., a.k.a. Iron Heart, in 2003 as a heavyweight clothing brand initially geared toward Japan’s motorcycling community. Iron Heart creates classic and timeless clothing crafted out of the finest materials and achieves the highest standards by closely working with fabric development, garment manufacturing, and the brand’s cult community. Over the years, Iron Heart has become the definition of bullet-proof garment construction. Staying true to their slogan,...
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