If you're asking what size shearling jacket you should order when you're between sizes, two measurements settle the question. Your shoulder width sets the floor: if only the larger size clears your shoulder points cleanly, that's your size, and the conversation ends there. Your chest circumference, measured over the layers you actually plan to wear, sets the ceiling: if the smaller size fits your shoulders and closes comfortably over a sweater, choose the smaller size and confirm it against the brand's garment measurements before ordering.
Shearling jacket sizing is harder to nail than a regular leather jacket for three reasons. The dense wool fleece lining takes up interior space the shell doesn't show from the outside. The shell has no stretch to compensate for miscalculation, and shoulder seams on a shearling coat are expensive to alter, sometimes structurally impossible to move cleanly. Getting the size right before checkout isn't a minor detail; it determines whether you keep the jacket. Here's how to use garment measurements to make a confident call.
What size shearling jacket should I order if I am between sizes: Key takeaways
- Shoulders decide first: If only one size fits your shoulder points correctly, that size is non-negotiable. Shoulder alterations on shearling are costly and often structurally impractical.
- Measure while layered: Wrap the tape around your chest while wearing the sweater or midlayer you plan to wear under the jacket. A bare-body number gives you a false baseline.
- Compare jacket to jacket: Measuring a well-fitting jacket you already own and matching it against garment specs is more reliable than any size-label conversion.
- Wool eats space: Dense fleece reduces effective interior room compared to a smooth-lined leather jacket of identical garment dimensions. Factor that in when comparing measurements.
- Break-in is modest: Expect roughly a quarter to a half size of comfort improvement after several weeks of wear, not a full size. Buy for the fit you need on day one.
- Style changes the rule: Fitted aviators and B3 bombers favor the larger size when you're between sizes. Roomier long coats often do not.
How to take the three measurements that actually matter
Grab a soft tape measure and get a second person to help. Self-measuring introduces inconsistency, especially across the back, and that's typically the hardest dimension to capture accurately on your own. One off measurement can cost you a return.
Start with your chest. Wrap the tape around the fullest part of your torso, keeping it level across your shoulder blades in the back and across your nipple line in front. The critical detail: wear a midweight sweater while you do this if that's what you plan to layer under the jacket. A bare-body chest number sounds precise but becomes useless the moment you button up over a thermal on a January commute in Chicago.
Next, measure your shoulder width across the back between the two bony points where your shoulders end. This number carries the most weight of the three. Shoulder alterations on shearling require dismantling and resetting the entire sleeve into the armhole, and even a skilled leather specialist may not achieve a factory finish afterward. The shoulder seam on your jacket should land at or just inside your shoulder point. Any droop down the arm is a structural problem that layering won't solve.
Sleeve length and back length come third, and they're more forgiving. Measure from your shoulder point to your wrist bone with your arm slightly bent. Sleeves can be shortened from the cuff by a good leather specialist; costs vary widely depending on construction and hardware, so request a quote before committing to alterations. Back length matters most on long coats and dusters; for a cropped bomber, it's worth checking if you have a long torso, but it's rarely the deciding factor.
How to decide what size shearling jacket to order when between sizes: reading garment measurements
Most brands list a finished garment chest circumference: the number you get when you measure the jacket flat from armpit to armpit and double it. This number is always larger than your body chest measurement because it includes the ease already built into the pattern. Comparing your bare body chest to a garment chest and expecting them to match will cause you to order too small every time.
The most reliable method is to skip the conversion entirely. Lay a jacket you already own and love flat on a table, zip or button it closed, and measure pit-to-pit, shoulder width, and sleeve length using the same endpoints listed in the brand's size chart. Matching geometry against geometry cuts out guesswork about ease and fit preference. The label is irrelevant; the dimensions are the proof.
One rule that trips people up: compare like for like. A slim motorcycle jacket holds completely different proportions to a boxy B3 bomber. If you compare a fitted moto jacket against a heavy aviator coat, the numbers will mislead you. Shearling Leathers carries multiple styles, including B3 bombers and long aviator coats. Pull up the specs for the exact style you're considering and compare against a previous bomber or heavy outerwear piece of similar silhouette.
How much room to build in for layering
When you measure your chest over a light sweater, look for a finished jacket chest that sits about 5 to 6 inches larger. For a thick or chunky knit, that gap needs to be 6 to 8 inches. If you're stacking a sweater over a hoodie for serious cold, build in 8 to 10 inches of total ease. As a concrete benchmark: a 40-inch body chest needs roughly a 46- to 48-inch finished jacket chest to close comfortably over a chunky sweater in a shearling style.
The practical method is simpler. Put on the heaviest sweater you plan to wear underneath. Measure your chest at its fullest point. Then choose a jacket whose finished chest circumference sits about 2 to 4 inches larger than that layered number. Confirm that the jacket closes without strain and allows you to cross your arms and raise them freely. Because shearling is itself bulky and insulating, don't add ease twice by measuring bare-body and then inflating the number further for layers.
Unlike a soft fabric coat that drapes and adjusts, shearling doesn't give. If the chest is only 1 inch tight when buttoned over a sweater, it's unlikely to improve substantially with wear, expect only a modest comfort gain of roughly a quarter to a half size after break-in, not a meaningful change in fit. This is why between-sizes decisions almost always favor the larger option when heavy layering is in the plan. The exception is when going up creates a dropped shoulder, which is a problem no amount of layering corrects and no easy alteration fixes.
How the wool lining changes interior fit and what break-in can realistically deliver
Two shearling jackets with identical garment measurements and two smooth leather jackets with identical garment measurements are not the same experience. The wool fleece projects inward from the leather shell across the torso, sleeves, collar, and cuffs, reducing the usable interior space. The denser the pile, the more pronounced the effect. This is why some shearling-specific size charts recommend going up one size from your usual leather jacket size, and why a smooth-lined piece you already own may not translate directly to a shearling equivalent.
Many buyers hope a snug shearling will loosen over time. Here's what actually happens. The leather shell softens and molds to your posture in high-movement areas, particularly across the chest, upper back, and elbows, after several weeks of regular wear. The wool compresses slightly at the torso and elbows where it's repeatedly contacted. In practice, this translates to a comfort improvement of roughly a quarter to a half size. A jacket that closes without strain but feels slightly firm may break in well. A jacket that hurts to close, restricts shoulder movement, or pulls uncomfortably across the back will not break in to fit, it's the wrong size.
Does the jacket style change the sizing rule?
Yes, and it changes it meaningfully. Structured, cropped styles like the B3 bomber and heavy aviator are cut close through the torso and shoulders, with added bulk from thick collars, buckled cuffs, and dense shearling throughout. When you're between sizes, the larger option is almost always safer. A tight chest restricts arm movement, and a constricting collar on a closed B3 becomes genuinely uncomfortable during a long commute or ride. The one exception: if the bomber is already cut with a deliberately oversized silhouette, the smaller size may produce better shoulder placement without sacrificing warmth.
Long shearling coats and dusters follow different logic. These styles are typically cut with a roomier, draped profile that already accounts for layering. Between sizes, the smaller option often gives you cleaner shoulder seams and easier movement through the body. Size up on a long coat only when the smaller option pulls visibly across the back or hips, or when you're planning to wear it over very heavy layers regularly.
| Style | Typical cut | Between-sizes default | Exception |
|---|---|---|---|
| B3 bomber / aviator | Structured, boxy, cropped | Size up | Stay smaller if cut is already oversized |
| Standard bomber | Hip-length, rounded | Size up if layering heavily | Smaller size if wearing thin base layers only |
| Long coat / duster | Draped, full-length | Stay with smaller size | Size up if back or hips pull, or layers are very thick |
How to make the final call with confidence
The right decision follows a clear sequence. First, check whether both sizes clear your shoulder points without drooping. If only the larger size works across the shoulders, order the larger size and stop there. That's your answer. From there, the chest takes over: put on your intended layers and check whether the smaller size closes without strain and allows you to raise your arms and cross them freely. If it does, choose the smaller size. If the chest pulls or the closure is forced, choose the larger size.
When you're asking what size shearling jacket to order between sizes, the most useful tool is a garment measurement chart. Pull up the specs for both sizes you're considering, record the chest, shoulder, and sleeve numbers, and hold them against either your tape measurements or the specs of a jacket you own that fits correctly. That comparison will resolve most between-sizes questions without guesswork.
When the numbers still land exactly in the middle or the shoulder and chest proportions of a specific style feel uncertain, reach out to the store's customer support team directly before placing your order. A quick message about styles like the B3 bomber or long aviator coat, where shoulder and chest proportions vary more than a standard chart conveys, can save you a return and get you to the jacket you'll actually reach for every time the temperature drops.
Shoulders must fit from the start because they can't be moved without significant cost and risk. The chest needs enough room to close over your intended layers without strain. Sleeves can be shortened by a leather specialist if necessary, and modest waist room is easier to adjust than missing inches across the back. If you remember nothing else about shearling jacket sizing, remember this: what size shearling jacket you should order when you're between sizes comes down to shoulder clearance first, layered chest second, measure both before you click buy.
Frequently Asked Questions
Will a shearling jacket stretch out and fit better after we wear it a few times?
Yes, but only modestly, expect roughly a quarter to a half size of comfort improvement after several weeks of wear. The leather shell softens and molds in high-movement areas and the wool compresses slightly, but a jacket that is painfully tight or restricts shoulders will not break in to fit.
Will a shearling jacket become significantly roomier after I wear it a few times?
No, a shearling jacket will not become significantly roomier after wear; expect only a modest comfort gain of roughly a quarter to a half size. The leather shell softens and the wool compresses slightly in high-movement areas over several weeks, but a jacket that is painful to close or restricts shoulder movement will not break in to fit.
Can I order the same size in shearling that I wear in a smooth-lined leather jacket?
Not necessarily; shearling often requires a different size because the dense wool lining reduces usable interior space compared with a smooth-lined piece. Many shearling-specific charts recommend going up one size from a usual leather size, and a smooth-lined jacket you own may not translate directly to a shearling equivalent.
If a bomber or aviator is labeled oversized, is it safe to choose the smaller size when I'm between sizes?
Yes, when a bomber or aviator is deliberately oversized, the smaller size can produce better shoulder placement without sacrificing warmth. That is the exception to the general rule that structured, cropped styles favor the larger option when between sizes.
Are sleeve length alterations on a shearling jacket doable if the sleeves are too long?
Yes, sleeves can be shortened from the cuff by a good leather specialist, but costs vary widely depending on construction and hardware. Request a quote before committing to alterations because sleeve shortening is feasible but not uniformly inexpensive.