Jacket Types and Comparisons
B-3 vs. B-6 Jackets: Key Differences
The B-3 is a bulky sheepskin bomber with a two-strap collar; the B-6 is lighter, trimmer and one-strap. Compare collar, fleece, fit and warmth.
Verdict: The B-3 is the heavy one. It is a bulky sheepskin bomber with a deep fleece and a wide collar closed by two straps, built for high-altitude bomber crews. The B-6 is its lighter, trimmer sibling: same family look, shorter fleece, a smaller one-strap collar and a cut made for moving in small cockpits.
Pick a B-3 for deep cold and a big silhouette. Pick a B-6 for everyday winter wear with less bulk. This comparison is part of our jacket types and key differences guide.
B-3 vs B-6 at a glance
A note on sources: no museum or specification record for the B-6 was readable for this page. Its details come from a reproduction maker and a collector forum, so treat the exact measurements as approximate.
| Column 1 | B-3 | B-6 |
|---|---|---|
| Role | Warmth for high-altitude bomber crews | "Intermediate Zone" jacket for movement in small aircraft |
| Fleece (pile) | About 1/2 in (13 mm), per a collector source | About 1/4 in (6 mm), sheared shorter |
| Collar | Wide sheepskin collar, two leather straps | Smaller collar, one buckled strap |
| Fit | Far bulkier than typical flight jackets | Trimmer, with back action pleats and waist zippers |
| Wind flap | Full-length behind the zipper | None |
| Adopted | Sources disagree: 1934 or World War II | 1939, per Buzz Rickson's |
| Our pick for | Very cold days, big shearling look | Cold days with less bulk, closer fit |
Where each jacket comes from
Both are U.S. Army Air Forces sheepskin flight jackets. Shearling flight jackets are counted among the warmest flight jackets, and the B-3 is the best-known example.
The B-3 came first. Its date is disputed: Miolook says 1934, while Aero Leather says it was designed during World War II. It was made for crews flying unheated bombers, where some raids reached 25,000 ft (7,600 m) and −58 °F (−50 °C).
The B-6 followed. Reproduction maker Buzz Rickson's says it was formally adopted in 1939 for the "Intermediate Zone": crews who did not need full B-3 warmth but did need to move in small aircraft. A collector post adds that more closed-cockpit planes created the need for a lighter jacket.
The full story of the B-3 and the sheepskin flying jacket is on our history of the aviator jacket page.
The key differences
Collar and straps
The B-3's wide sheepskin collar can be closed with two leather straps. The B-6 has a less substantial collar with a single buckled strap. From across a room, the collar is the quickest way to tell them apart.
Fleece depth and warmth
The collector source puts B-3 pile at about 1/2 in (13 mm) and B-6 pile at about 1/4 in (6 mm). Buzz Rickson's also says the B-6 sheepskin was sheared shorter. Shorter pile means less warmth and less bulk.
The same post says the B-6 was warm enough for some marginally heated fighter cockpits but not for high-altitude bomber crews.
Fit and movement
The B-3 is far bulkier than typical flight jackets and has no knit waistband or trim fit. The B-6 was cut for movement. It has action pleats at the back and zippers at both sides of the waist to adjust the fit.
Pockets and wind flap
The collector post describes the B-6 with two flush-sewn slash pockets and zippers or straps at the cuffs. It also says the B-6 lacks the B-3's full-length wind flap behind the zipper.
Which should you choose?
Our view: for most people who walk, drive and sit indoors between stops, the lighter B-6 is easier to live with. A B-3 earns its bulk only where cold is serious. For build-based advice, slim frames often suit shearling aviators that add volume, according to Rudsak.
| Choose a B-3 if... | Choose a B-6 if... |
|---|---|
| Your winters are very cold | Your winters are cold but not extreme |
| You like a big collar you can strap shut | You want a smaller collar and a cleaner look |
| You don't mind bulk | You want to move, drive or ride in it more easily |
| You want the classic heavy "bomber" silhouette | You want a closer, trimmer fit |
What to check on a modern B-3 or B-6 style
Jackets sold under these names vary a lot. Check these points before you buy:
- Collar straps: two for a B-3 look, one for a B-6 look.
- Fleece: real lambskin shearling or artificial fur. Shearling is sheepskin tanned with the wool left on.
- Cuffs and waist: many modern versions add knit cuffs and a knit waistband. The original B-3 had none, per the dealer description.
- Room for a sweater: a B-3 is usually worn over layers, so measure over what you plan to wear.
For outfits, see how to wear a shearling jacket.
Shop a B-3 style shearling jacket
The Leather Collection Brown Aviator B-3 Shearling Bomber Jacket follows the B-3 shape with a wide fur collar, in 1.0 to 1.1 mm sheepskin. You choose artificial fur or lambskin shearling, and it is hand-stitched to order.
Unlike the original, it has knit cuffs and a knit waistband with a buckle tab. The store says it should feel roomy in the chest so a sweater fits under it. The store does not list a B-6 style.
FAQ
What is the difference between the B-6 and B-3 bomber jackets?
The B-3 is heavier, with deeper fleece and a two-strap collar. The B-6 has shorter fleece, a one-strap collar and a trimmer cut for movement.
What is a B-3 jacket?
A heavy U.S. sheepskin flight jacket made for bomber crews at high altitude, with a wide strapped collar.
How warm is a B-3 jacket?
Shearling flight jackets like the B-3 are counted among the warmest flight jackets. One dealer says it was meant to keep crews warm at 25,000 ft.
How should a B-3 jacket fit?
Roomy in the chest so a sweater fits underneath, with sleeves reaching the wrist bone, according to Leather Collection. See also how should a bomber jacket fit?
Related comparisons
- Bomber jacket vs flight jacket
- Aviator jacket vs bomber jacket
- How bomber jackets compare with other jacket styles
- For the A-2, G-1, MA-1 and the rest, see types of bomber jackets and their features.
Sources
- Buzz Rickson's, Type B-6 product history
- Vintage Leather Jackets forum, So what's a B-6 for? (collector discussion)
- International Military Antiques, Original WWII B-3 sheepskin bomber jacket
- Wikipedia, Flight jacket
All read 2026-10-10.
leatheride Editorial Team
leatheride articles are researched from published sources, cited in the text, and reviewed before publication.