Freewheelers 37J1 'Aviator' Horsehide Jacket (Tatanka Brown)

FW standards just keep on flying higher and higher!

When talking about vintage aviator style jackets there's one that stands out! This one takes inspiration from the US military contractor (Leather Togs MFG.Co.) from 1927. Originally this style was made with sheepskin due to available materials of the past era but FW has taken this one to their standards by using their own specially developed horsehide. This style is the icon of classic aviation jackets before the famous A1.

FW exclusively used Shinki leathers for this piece and specially developed the production-run to their exact taste! The 1.2mm thick horsehide is veggie tanned from raw hides which yields a unique texture with so much more depth than typical aviator leather jackets that have a flat brown colourway. You can see that the surface has a subtle sheen with many shades of deep burgundy-brown.

Timeless details like the waist pockets have been re-fined to FW perfection. Looking closely you can see that the shapes are slightly curved for a unique look unlike the plain, straighter shapes of the vintage versions. This level of accuracy is incredible and can only be executed by some of Japan's best artisans.

For those who may not know, making leather jackets with buttons to a high-end standard is extremely difficult. The buttonholes must be skilfully sewn with a curved opening that maintains shape for life whilst having an elegant appearance. Each heavy nut button is sewn with a reinforcement button on the reverse side and all snaps feature leather reinforcements for durability.

The internal lining is made up of a mid-weight moleskin fabric created with waxy cotton for a smooth silky feeling. This is much more breathable than polyester or nylon linings and adds additional warmth.

The collar features an additional snap for keeping your neck warm. All openings feature vintage machine woven ribbing that's durable and keeps the wind out!

For the best of the aviation gears of the past, this is it. If you have never tried any of FW's leather jackets we guarantee you will be impressed with their passion for crafting some of the BEST leather jackets in Japan!

  • Shell: 1.2mm vegetable tanned & brown uneven dyed horsehide
  • Lining: Japanese medium weight cotton moleskin
  • Ribbed collar, cuffs & hem
  • Ultra large natural nut buttons
  • Twin front waist pockets
  • Slim fit
  • Made In Japan

ATTENTION: Due to it is some most expensive jacket, we will ship this leather jacket via DHL Premium service internationally without any surcharge.

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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.