Freewheelers "Grease Monkey" Overall Trousers (Dark Brown)

Size Guide

Timeless workwear style from the early 20th century!

Freewheelers have trawled through vintage archives to bring us the "Grease Monkey" Overall trousers inspired by the uniforms worn by American car mechanics in the 1930s.

Constructed with Freewheelers' specially-developed, high-density medium weight cotton twill fabric, which has been slowly woven on vintage machines to produce a highly durable yet comfortable fabric! The dark-brown thread-dyed colourway will age to a soulful look with wear and washes, just like an authentic pair from the 30s!

Construction-wise, this pair features classic workwear details such as reinforced double fabric on the knee section and back pockets, ensuring they remain durable even through heavy wear. As usual, Freewheelers have packed this garment with a ton of amazing details with a specially-developed red chambray fabric used for the pocket bags and lining on the vintage-spec one-piece fly! Other workwear details include a hammer loop on the back rise, as well as a tool pocket on the thigh area.

The fit is elegantly shaped for an authentic early 20th-century silhouette with a high rise, comfortable thigh gradually tapering to the leg opening.

If you are looking for one of the best Japanese workwear trousers inspired by 1930s mechanic uniforms, you can't ignore Freewheelers!

  • 100% Cotton
  • Japanese medium-weight high-density cotton twill
  • Colour is yarn-dyed
  • Black coated iron buttons
  • One-Piece button fly construction
  • Extra 'Bar-tack' stitched pockets
  • Japanese lightweight heather chambray inner pockets
  • Once washed (minimal shrinkage)
  • High rise/Relax Tapered 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.