The Flat Head 12oz Selvage Denim Workshirt

Size Guide

The denim work shirt is an all-time classic wardrobe staple for lovers of vintage and workwear styles. Looking at The Flat Head's 12oz Denim Workshirt, it's hard not to argue that this is the most perfect version we've seen!

A lot of denim brands opt for cheaper denim with less character when selecting the material for their denim shirts - NOT The Flat Head! They've spared no expense and specially developed their own 12oz orange selvedge I.D denim fabric that has been woven slowly with vintage shuttle looms to create a mild slubby vertical texture.

The denim has been grand indigo thread-dyed 24 times to create a deep, rich indigo hue. With long-time use, this will slowly fade to reveal many hues of light and dark indigo with a strong vertical fading texture like their 3XXX Pioneer denim!

Construction-wise, this shirt is built like a tank! Instead of the more standard twin-needle stitching, The Flat Head has used triple-needle chain stitching throughout for added durability. This will ensure you can enjoy wearing this shirt for many years to come!

This shirt features many subtle details that add to the elegance of the design. The cat's eye iron buttons will age alongside the denim as the black-coating chips away to reveal the metallic colour underneath. Red bartack reinforcements on the breast pockets add subtle accents to the overall look. White bartack stitching has also been used to reinforce the chain stitch run-off. For added comfort, ventilation holes have been sewn into the armpits using vintage eyelet machines. Finally, indigo chambray lining has been used in the cuffs, placket, collar and yoke for extra durability and comfort. With time you can enjoy the beauty of indigo chambray and denim ageing together!

If you are looking for one of the best denim work shirts with premium textured fabric, next-level construction and elegant details, The Flat Head's 12oz Denim Workshirt could be a perfect choice!

  • 100% Cotton
  • Japanese 12oz orange colour selvage ID denim
  • Grand indigo is yarn-dyed
  • Twin chest pockets with pencil slot
  • Bar-tack reinforcements for the chest pockets
  • Black coated 'Cat's Eye' iron buttons
  • Japanese 5oz indigo chambray lined collar, placket & cuffs
  • Ventilation holes in the armpits
  • Chain-stitching construction
  • Once washed (minimal shrinkage)
  • Slim fit
  • 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.