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Iron Heart 383-BRN - T/C Mechanics Shirt - Brown
Iron Heart 383-BRN - T/C Mechanics Shirt - Brown

Iron Heart

383-BRN - T/C Mechanics Shirt - Brown


Garment Measurements | Virtual Size Chart


The Iron Heart IHSH-383-BRN Mechanics Shirt is a medium-weight, reinforced piece produced from a sanforized, once-washed Japanese Tetoron Cotton Twill that's appropriate as an all-season style staple. Using the new Iron Heart Mechanics Shirt pattern, this piece is perfectly proportioned and made to be worn untucked with a square hem and split side seam for vintage-styled grit in a design that uniquely leverages a twill inspired by military fabrics while saluting shop shirts from the '50s. This medium-weight tetoron fabric is loomed in Japan from sustainably focused Organic Cotton and Recycled Polyester fibers spun into a single yarn and woven as a twill with a slight sheen to yield a durable fabric with a balanced structure and drape. The Mechanics Shirt has numerous and carefully considered construction and design details that improve the original inspiration like the charcoal grey pearl and nickel snapped dual flap front patch chest pockets, front placket, and barrel cuffs. Further, a double-needle stitched squared back yoke and finishing with felled seams and bartack reinforcements throughout give this piece all the necessary heritage provenance and then some. The Brown Mechanics Shirt balances classic and modern applications, making it a future heirloom, a year-round go-to, and a substantial staple piece that will only improve with wear. Built for the biker and over-engineered to start, the Iron Heart 383-BRN tests the limits of what can be artfully woven and sewn, delivering a lifetime of durability in a service-ready design.


  • Standard Fit
  • Japanese Tetoron Cotton Twill
  • Sanforized - One Wash
  • Reactive Dyed
  • 50% Organic Cotton / 50% Recycled Polyester
  • Orange Thread Interior Chainstitching
  • Dual Snap Flap Front Chest Pockets
  • Straight & Side Split Hem
  • Snap Barrel Cuffs
  • Charcoal Pearl & Nickel Snaps
  • Felled Seams
  • Single & Double Needle Construction
  • Bartack Reinforced
  • Made in Japan


Model Measurements: 5'9" | 165 lbs. | 41" Chest | 34" Waist - Wearing Size L

Iron Heart Shirting sizing is graded in small increments. The 383 Mechanics Shirt runs true to Iron Heart sizing and is made with a sanforized, once-washed fabric with all shrinkage removed. With regular use, one can expect little to no stretch or shrinkage over the long term.

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