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Iron Heart 323-OD - Work Shirt - 10oz Selvedge Indigo Denim Overdyed Black
Iron Heart 323-OD - Work Shirt - 10oz Selvedge Indigo Denim Overdyed Black

Iron Heart

323-OD - Work Shirt - 10oz Selvedge Indigo Denim Overdyed Black


Garment Measurements | Virtual Size Chart


The Iron Heart IHSH-323-OD Work Shirt is a hardy, reinforced piece produced from a 10 oz. sanforized Japanese Selvedge Denim produced in Kojima, Japan and reactive Overdyed Black to present a saturated, solid midnight denim. Using the signature Iron Heart Work Shirt pattern, this piece is perfectly proportioned in length to be worn untucked for modern, vintage-styled grit. Contrast stitching is offset with a reactive black overdye designed to hold its color over a medium shirting weight denim that will soften to feel like a hearty chambray. Subtle fading potential when worn heavily will convey that workshop class in a versatile steely charcoal palette. This Work Shirt has numerous and carefully considered construction and design details like the squared shoulder and back yoke panel, which is paired with signature Iron Heart cats eye buttons on the front placket and dual patch front chest pockets with pencil slot, comprising a piece for the stylistically sound and self-reliant. Further, selvedge line reveals on the placket and cuffs, internal felled seams, and chainstitched construction give this piece all the necessary heritage provenance, and then some. The Black Overdyed Selvedge Denim Work Shirt strikes the balance between classic and modern applications, making it a future heirloom, a year-round go-to, and a substantial staple piece that will only get better with wear. Built for the biker and over-engineered to start, the Iron Heart 323-OD Work Shirt tests the limits of what actually can be artfully woven and sewn, delivering a lifetime of durability in a work-ready design.


  • Standard Fit
  • 10 oz. Japanese Selvedge Denim
  • Sanforized - Rinsed
  • Black Dyed Selvedge Line
  • Indigo Dyed Denim & Black Reactive Overdyed
  • 100% Cotton
  • Contrast Stitching
  • Dual Button Front Chest Pockets
  • Pencil Slot Chest Pocket
  • Back Yoke Panel
  • Interior Placket and Cuffs Selvedge Line
  • Button Cuffs
  • Black Cats Eye Buttons
  • Felled Seams
  • Chainstitched Throughout
  • Bartack Reinforced
  • Made in Japan


Model Measurements: 6'2" | 175 lbs. | 41" Chest | 32.5" Waist - Wearing Size L

Iron Heart Shirting sizing is graded in small increments. The 323-OD runs on the small side of Iron Heart sizing and is made with a sanforized and overdyed fabric with all shrinkage removed. With regular use, one can expect little to no stretch in the chest over the long term.

We recommend consulting our Sizing Guide and using our Virtual Size Chart.

Please feel free to Contact Us for additional assistance.

About Iron Heart

After 20 years of working in the garment industry in Japan, Shinichi Haraki established Works Inc a.k.a. Iron Heart in 2003 as a heavyweight Japanese clothing brand, initially aimed at the Japanese motorcycling community. Over the years and in partnership with the UK heritage community, the brand has become the pinnacle definition of bullet-proof garment construction. Originally made for bikers, Iron Heart pushes the design and construction of the clothing to the limit of what can actually be woven and... View All Iron Heart Products