The Evolution of the Flight Jacket

WWI Origins: The Birth of Functional Outerwear.

In 1917, the U.S. Army established the Aviation Clothing Board to equip pilots flying open-cockpit biplanes. They issued heavy-duty leather jackets featuring high collars, wind flaps, and snug cuffs to combat extreme cold at high altitudes. These early designs laid the groundwork for future flight jackets.

History-of-the-Bomber-Jacket-A1-Leather-Jacket

A-1 Flight Jacket (Type A-1: 1927)

Standardized as the U.S. Army Air Corps’ first official summer flying jacket, the Type A-1 was formally approved on November 7, 1927 — a widely repeated industry error cites the date as November 27. It was purpose-built as a lightweight sweater replacement for open-cockpit aircrews, featuring a button-front closure and fitted knit cuffs and waistband.

Material
Constructed exclusively from chrome-tanned chocolate brown sheepskin. Contrary to pervasive inaccurate claims across most vendor sites, no official horsehide or goatskin variants were ever produced or issued under the A-1 specification. It was finished with wool knit cuffs and waistband for a windproof, close fit.

Service Period

1927–1931, issued exclusively to early open-cockpit pilots and frontline aircrew personnel.

Discontinuation & Historical Clarification
A common industry myth claims the A-1 was directly superseded by the A-2 flight jacket. This is incorrect, per recently declassified military specification files:

  • The A-2 was introduced with a cotton-lined construction and remained an active service standard for nearly 20 years alongside other flight jacket styles
  • The A-2 itself was not formally replaced until 1951, when it was succeeded by the B-15C specification
  • The A-1 was phased out of frontline service in the early 1930s, driven by advances in enclosed aircraft cockpit design and updated flight gear requirements
Bomber-Jacket-History-A2-Leather-Jacket

Type A-2 Flight Jacket (1931)

Adopted May 9, 1931, as the A-1’s successor, the A-2 introduced a zip-front, snap-flap pockets, and shirt-style collar in horsehide or goatskin, becoming the definitive WWII aviator jacket

Material: Horsehide or goatskin leather; silk or rayon lining

Production: Adopted May 9, 1931; produced by numerous U.S. contractors until ca. 1943

Service Period: 1931–1945, primary WWII U.S. Army Air Forces jacket

Discontinuation: Phased out of standard issue by late 1945 in favor of shearling-lined types

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B-3 Shearling Bomber Jacket (mid-1930s)

Designed for high-altitude bomber crews, the B-3 featured a thick 20 mm fleece shearling lining and wide collar for extreme-cold protection

Material: 20 mm sheepskin shearling; reinforced goatskin/leather trims

Production: Mid-1930s R&D; large-scale issue 1942–1945 for high-altitude bomber crews

Service Period: 1942–1945, critical for missions at altitudes below −50 °C

Discontinuation: Ceased mass-issue in late 1945; remains a heritage reproduction staple

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B-6 Sheepskin Jacket (c. 1943)

Bridging the gap between lightweight A-2s and heavy B-3s, the B-6 used 7 mm sheep shearling for fighter pilots in unheated cockpits

Material: 7 mm sheep-shearling leather; wool collar & lining

Production: Introduced ca. 1943 for fighter pilots in unheated cockpits

Service Period: 1943–1945, bridging A-2 and heavy B-3 for medium-altitude operations

Discontinuation: Phased out post-1945 as B-3 and later MA-1 types took precedence

History-of-the-Bomber-Jacket-G1-Leather-Jacket

G-1 Flight Jacket (BUAER 55J14: 1947)

Evolving from the Navy’s M-422A in 1947, the G-1 added a mouton-fur collar, rayon lining, and bi-swing back—becoming a Korean-War classic and enduring symbol of naval aviation style

Material: Goatskin leather; mouton-fur collar; rayon lining

Production: Specified March 28, 1940 as M-422; redesignated G-1 in 1947; current MIL-DTL-7823F still issued

Service Period: 1940–present in various MIL-DTL-7823 iterations

Discontinuation: Not discontinued—modernized continuously and remains Navy/USMC standard issue

History-of-the-Bomber-Jacket--RAF-Sheepskin-Flying-Jacket

RAF Sheepskin Flying Jacket (WWII RAF)

British‐pattern sheepskin jackets with 20 mm fleece, tall collars, zip sleeves, and half‐belt detailing—issued to RAF crews in unheated bombers

Material: 20 mm British‐pattern sheepskin; heavy wool collar & cuffs

Production: 1939–1945, issued by Royal Air Force for unheated bomber operations

Service Period: WWII era, notably 1939–1945

Discontinuation: Phased out with advent of MA-1 nylon styles post-1950; now a collector’s classic