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Iron Heart 307-OLV - Work Shirt - 13oz Military Serge Twill Olive
Iron Heart 307-OLV - Work Shirt - 13oz Military Serge Twill Olive

Iron Heart

307-OLV - Work Shirt - 13oz Military Serge Twill Olive


Garment Measurements | Virtual Size Chart


The Iron Heart 307-OLV Work Shirt is a hardy, reinforced piece produced in a proprietary Japanese 13 oz. sanforized and rinsed Military Serge Twill in an Olive drab color designed to evolve with its wearer. 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 heavy duty 2x2 serge fabric provides a clean, tonally textured aesthetic with a pronounced ribbed twill weave from yarns that have been sulfur dyed to fade when worn as hard as intended to convey workshop class in a versatile palette. This Work Shirt has numerous and carefully considered construction and design details like the squared shoulder double needle stitched back yoke, 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, internal felled seams and chainstitched construction with inseam run-off gives this piece all the necessary heritage provenance, and then some. The Olive Military Serge Twill 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 307-OLV 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
  • 13 oz. Japanese Military Serge Twill
  • Sanforized - One Wash
  • Sulfur Dyed
  • 100% Cotton
  • Brown Thread Interior Chainstitching
  • Dual Button Front Chest Pockets
  • Pencil Slot Chest Pocket
  • Button Cuffs
  • Black Cats Eye Buttons
  • Felled Seams
  • Chainstitched Throughout & Run-off
  • Bartack Reinforced
  • Made in Japan


Model Measurements: 5'11" | 165 lbs. | 40" Chest | 32.5" Waist - Wearing Size M

Iron Heart Shirting sizing is graded in small increments. The 307-OLV runs true to Iron Heart sizing and is made with a sanforized, once washed fabric with most shrinkage removed. With regular use, one can expect up to .5-1” of 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