Shopping Bag
Iron Heart 123J-OD - Work Jacket - 14oz Broken Twill Selvedge Denim Indigo Overdyed Black
Iron Heart 123J-OD - Work Jacket - 14oz Broken Twill Selvedge Denim Indigo Overdyed Black

Iron Heart

123J-OD - Work Jacket - 14oz Broken Twill Selvedge Denim Indigo Overdyed Black


Garment Measurements | Virtual Size Chart


The Iron Heart IHJ-123-OD Work Jacket is an improved, modern version of the workwear original and serves as a heritage statement piece produced from a 14 oz. medium weight, sanforized and once washed Broken Twill Selvedge Denim from Kojima, Japan. Inspired by workwear mechanics jackets from the 1950's-60's, the Work Jacket features a tailored silhouette that allows for movement with a longer body to fall well below the belt line for modern-styled grit. A new fabric within the Iron Heart collection, this 100% cotton broken twill denim is a non-directional weave achieved with vintage shuttle looming that creates a zig-zag pattern and allows for greater flexibility and give. Produced with the signature dual twisted weft yarn method to add structure and a slub texture, this 14 oz. denim yields a unique and dutiful heritage style piece. Featuring a rope dyed indigo warp and a natural colored weft denim and given a garment overdye treatment with black sulfur, this steely charcoal piece will evolve into dark shades of blackened blues with subtle to high contrast fade patterns over years of hard use as intended. Created to be a functional outerwear piece from spring through fall, the Work Jacket features snapped flap patch chest pockets, welted D-stitched slash front hand pockets with twill lining, a two-way zipped front placket with an interior selvedge line, adjustable copper snapped cuffs and hem, and is finished with internal felled seams and chainstitched construction throughout. Over-engineered to start, the 123J Work Jacket will deliver a lifetime of durability in an unmistakable design that's packed with over-the-top details. Striking a perfected balance between reproduction and evolved interpretation, this year-round go-to is a style staple that's ready for the workshop or sidewalk.


  • Standard Fit
  • 14 oz. Japanese Broken Twill Mid Tension Selvedge Denim
  • Proprietary Fabric
  • Sanforized - One Wash
  • Black Dyed Selvedge Line
  • Non-Directional Weave
  • Indigo Dyed Warp & Natural Weft
  • Sulfur Overdyed Black
  • 100% Cotton
  • Unlined
  • Dual Patch Snap Flap Chest Pockets
  • Welted D-Stitched Front Hand Pockets w/ Twill Lining
  • Two-way YKK Matte Nickel Zipper w/ Natural Leather Pull
  • Interior Placket Selvedge Line 
  • Copper Snaps
  • Snap Adjustable Cuffs
  • Snap Back Tab Adjustable Hem
  • Internal Felled Seams
  • Chainstitched Throughout
  • Bartack Reinforced
  • Made in Japan


Model Measurements: 6'2" | 175 lbs. | 41" Chest | 32" Waist - Wearing Size L

Iron Heart Outerwear sizing is graded in small increments. The 123J-OD runs on the small side of Iron Heart sizing and is made with a sanforized, once washed, and overdyed fabric with all shrinkage removed. With regular use, one can expect up to .5-1” of stretch in the chest over the long term. Consider going with the larger of your size range in Iron Heart or the next size up.

Our Method of measuring is different than Iron Heart. We recommend consulting our Sizing Guide and using our Virtual Size Chart to reference our Method when purchasing.

Please feel free to Contact Us for additional assistance.

About 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,... View All Iron Heart Products