Iron Heart 14oz Type 3 Denim Jacket

Size Guide

Iron Heart makes serious garments! With their expertise in heavy fabric and construction, their latest edition of the type 3 jacket in 14oz denim fabric is a real classic KILLA!

Iron Heart has been re-developing their 14oz fabrics after strong demand! This time, with a double twisted warp yarn! This gives the 14oz denim that ‘dark’ indigo look-alike their 21oz signature denim. These also come with an improved, slightly more rigid feel for stronger fades.

In terms of construction, the precise, triple tone poly-cotton stitching makes for a super durable, long-lasting jacket you can enjoy for decades! The thick silver-coated buttons will become more beautiful with wear and gain a shiny appearance as the iron core wears through. For improved functionality, the jacket features two additional lower chest pockets with a soft cotton twill lining and waist size adjusters!

If you are looking for a slim-fitting, classic type 3 denim jacket, this is a great option for all seasons!

  • 100% Cotton
  • Japanese 14oz red selvage ID double twisted warp denim
  • Grand indigo dyed
  • Twin chest pockets
  • Twin front hidden side pockets
  • "Iron Heart" iron buttons
  • Japanese vegetable tanned cowhide patch
  • Adjustable waistband
  • Slim fit
  • Once Washed (Minimal Shrinkage)
  • Made In Japan

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How We Measure

Pants and Shorts


With the major buttoned up open the jeans and lay them flat like shown. Measure from the front where the major button closes to the back belt loop. Then double this measurement to achieve the waist measurement.

The way we measure is different from 'Side to Side', If you are not used to our method you should downsize by 1 inch.

For example, side to side measurement for The Flat Head 3002 waist is 28inch and using our method 29.25 inch.

Front Rise:

With the jeans lying flat measure from the crotch bar tack to the top of the waistband. 

Back Rise:

Spread out the crotch so the bar tack is visible, then measure from the crotch to the top of the waistband.


One inch down from the crotch measure flat across to the other side.


Flatten the leg and measure along the inseam from the crotch to the leg hem. 

Leg Openning:

Measure straight across the hem from side to side.



Lay flat then measure from the shoulder's edge to the other shoulder's edge.


Lay shirt flat and measure from pit to pit.

Sleeve length:

With the sleeve flat measure from the shoulder to the cuff.

Arm hole openning:

Measure from the shoulder down to the pitt.

Vertical length:

With the shirt facing down, Measure from below the collar to the bottom hem.