To size a flight jacket for riding, buy for your chest and shoulders first, then check sleeve length and body length in the riding position. Flight jackets are cut trim, so a jacket that feels perfect standing at a mirror can pull across the back and ride up the wrists once your arms reach the grips. Size to your normal chest measurement plus the one layer you will actually wear, and do not count on the leather to stretch into a bad fit.
Know what cut you are buying
Flight jackets are not sized like a casual jacket, because each pattern follows a military cut. The Cockpit USA Horsehide A-2 is listed as a trim military fit with a 26 inch length, or 28 inches in Long. The Cockpit USA Mil-Spec G-1 is listed as a true trim military fit.
The Legendary Hellcat G-1 is listed as a civilian fit, which gives you more room than the mil-spec version. If you plan to ride in a sweater or a liner, that difference matters more than the label size.
Measure the right things
Measure your chest around the fullest part, under the arms and across the shoulder blades, while wearing the layer you will ride in. Add your sleeve length from the shoulder seam to the wrist bone with your arm slightly bent. Use the measuring guide on the product page, since each Cockpit USA listing includes one, and compare your numbers instead of guessing from a T-shirt size.
Some military-fit listings say outright to order your normal chest size and not to plan on layers underneath. Believe that. If you add a thick layer, move to the next size only after checking whether the shoulders still fit, because shoulders are the part you cannot fix.
Test the fit in the riding position
Sit on the bike, or mimic it by reaching forward with both arms as if gripping handlebars. The jacket should not pull hard across the shoulder blades, and the cuffs should still cover your wrist bones. A knit cuff and waistband, like the ones on the Hellcat and the A-2, help here because they seal the wrist and waist without relying on the leather to give.
The body should stay near your belt line instead of climbing toward your ribs. If it rides up when you reach, the cut is too short for your torso, and a Long size or a different pattern is the fix.
Do not buy it to stretch
Horsehide breaks in slowly, according to the Cockpit USA listing, and it is the wearing that softens it, not a size gain. Leather molds a little at the elbows and shoulders over time, but a jacket that is tight across the back on day one will stay tight in the saddle. Size for comfort now, then let the break-in do the rest.
A flight jacket is also not an armored riding jacket. It has no CE armor, so plan your layers around that. Our guide to flight jackets versus motorcycle jackets explains the difference, and the post on how to identify an authentic A-2 jacket helps you read the construction before you buy. To compare cuts side by side, browse the A-2 leather flight jackets or the G-1 leather flight jackets.
Size to your chest and shoulders, test the reach, and trust the cut named in the listing. If you land between sizes, choose the one that lets you reach the grips without pulling, and ask us before you order.
The Motorcycle Safety Foundation publishes rider training and gear guidance.
Frequently asked questions
- How should a flight jacket fit for riding?
- It should fit snugly across the chest and shoulders without pulling across the shoulder blades when your arms reach the grips. The cuffs should cover your wrist bones in the riding position, and the body should stay near your belt line instead of riding up. Test the reach, not just the mirror.
- Should I size up for layers under a flight jacket?
- Only if the shoulders still fit afterward. Military-fit listings often say to order your normal chest size and not plan on layers underneath. Decide on your riding layer first, measure with it on, and use the product page measuring guide instead of adding a size by habit.
- Is a G-1 sized differently than an A-2?
- Yes, they follow different patterns. The Cockpit USA Horsehide A-2 is listed as a trim military fit, the Cockpit USA Mil-Spec G-1 as a true trim military fit, and the Legendary Hellcat G-1 as a civilian fit. The Hellcat gives more room for layers than the mil-spec version.
- Will a leather flight jacket stretch to fit me?
- Not much. Horsehide breaks in slowly and softens at the elbows and shoulders with wear, but it will not turn a tight jacket into a loose one. Buy the size that fits across the shoulders and back now, then let break-in improve comfort.
- What if I am between sizes on a flight jacket?
- Choose the size that lets you reach the grips without pulling across the back, and compare your chest and sleeve measurements to the guide on the product page. If body length is the problem, a Long size, where offered, may fix it. Contact us before ordering if you are unsure.