Iron Heart Ultra-Heavy Flannel HBT Check Workshirt (Black X Grey)

Size Guide

Holy Herringbone!

Iron Heart never fail to deliver with their luxury-standard flannels, which have been bestsellers for decades!

This latest version features an amazing herringbone pattern, resulting in an even heavier flannel fabric compared with their standard heavyweight flannels.

Famous for its construction, Iron Heart's flannel fabric is slowly woven using vintage machines with thread-dyed colourways. This method results in patterns that are sharper and more textured, unlike brands that use cheaper printing methods.

For durability, this one is skillfully constructed using vintage machines and features classic workshirt-style chest pockets with a pencil slot. Classic work shirt details include chain stitch run-off, while the black urea buttons make up for a sharp, blacked-out look!

If you are looking for the holy grail of Japanese-made flannels Iron Heart could be a fantastic choice!

  • 100% Cotton
  • Japanese 14oz ultra heavy herringbone twill textured flannel
  • Colours are thread dyed
  • Twin chest pockets
  • snap buttons
  • Brushed interior
  • Once washed (minimal shrinkage)
  • Slim fit
  • Made In Japan

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How We Measure

Pants and Shorts


With the major buttoned up (i.e. the top button) open the jeans and lay them flat, like shown. Measure from the front where the major button closes to the back belt loop. Double this measurement to find the waist measurement.

The way we measure the waist is different from the 'Side to Side' technique. If you are used to the 'side to side' technique you can roughly roughly downsize by 1 inch.

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

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.