Fit is the whole argument for a leather jacket, and leather is not a forgiving material. The hide holds the shape it was cut into, and once a seam has been stitched the needle holes stay in the skin. Fit is decided before you order.
How should a leather jacket fit overall?
A leather jacket should sit close through the shoulders and chest, follow the body without pulling, and end where its cut intends — nothing about it should hang. The shoulder seam lands on the edge of your shoulder, the chest closes without strain lines from the fastening, the sleeve reaches the wrist bone, the hem falls where that cut says.
A leather jacket is chosen to fit rather than altered into fitting. A specialist can take a seam in, but old stitching leaves permanent perforations, and garment leather is assembled with narrow seam allowances, so there is little to let out.
Where should the shoulder seam sit?
The shoulder seam should land on the outer edge of your shoulder bone, where the flat of the shoulder turns down into the arm — not past it, not short of it.
If the seam sits inboard of that corner, the sleeve head is pulled up into the shoulder and you feel it the moment you reach forward. If it sits outboard, the sleeve head collapses into a fold on the upper arm and the jacket looks borrowed. Raglan and drop-shoulder cuts are the exception: there is no seam on the corner to read, so judge them from where the armhole and chest sit.
Otherwise the shoulder is the one dimension you cannot negotiate with: reworking it means dismantling the sleeve, the collar and usually the lining. Chest and waist ease can be lived with; shoulders decide the size. A stand-collar cut like the Onice Biker makes this plain, since there is nothing else in the design to look at.
How much room should there be in the chest, and does leather stretch?
Closed, you should be able to slide a flat hand between your chest and the jacket — a palm, not a fist. Leather relaxes with wear, but only in circumference, and it does not come back.
Hide has direction. A skin gives most across the backbone and least along it, and panels are generally cut so the give runs around the body rather than up and down it. Chest, waist and upper arm therefore ease slightly over a season of wear; sleeve and body length will not change in any way you can use. Buying a jacket with short sleeves hoping it drops is buying a jacket with short sleeves.
How much it eases depends on the skin: lambskin is thin and supple and gives soonest, calfskin is denser and gives later, cowhide holds its shape hardest. Quilting anchors the leather to its backing and limits how far a panel travels.
How long should the sleeves be?
With your arms hanging at your sides, the sleeve should just cover the wrist bone. That is the default; each cut then bends it.
A blazer stops a touch shorter, so a shirt cuff shows. A biker sleeve is often drafted deliberately long, ending near the base of the thumb, because a riding posture pushes the arms forward and pulls the cuff back; at rest it should look slightly generous. A cuff zip is a fitting device, not decoration.
Check the sleeve with arms out in front as well as down: if the cuff retreats up the forearm and stays there, it is short. Shortening a leather sleeve that ends in a zip means rebuilding the cuff.
How long should the body be, and where should the waist sit?
A short jacket should end at your hip bone or just above, and the jacket's waist should meet the narrowest part of your own. When those two points agree, the jacket lengthens the leg; when they do not, it shortens it.
Bombers make the test easy: the banded hem should rest on the hip, not ride above the navel and not sag onto the seat. On the Avorio Bomber the band is the silhouette, so its position is the fit. A cafe racer sits close and straight and finishes at the waistband, the logic behind the Velocita Cafe Racer. A leather blazer borrows from tailoring: longer body, hem roughly covering the seat, chest ease for a shirt and a fine knit, as on the Sartoria Blazer.
Coats are the one place where hem length is a proportion decision rather than a rule: above, at or below the knee all work. What does not work is sizing a coat at the shoulder to make its length behave: a long cut such as the Ombra Long Coat still starts there.
Should you judge the fit zipped or unzipped?
Judge it closed. A jacket that only looks right open does not fit: the fastening is where the pattern goes under load, and the first place a size error shows.
Close it and read the leather. Creases fanning from the zip mean the chest is tight. A collar that lifts off your neck as you reach forward means the back is tight across the blades. A hem that flares open means the waist or hip is tight, whatever the chest is doing. Then move: cross your arms, reach, sit down. Resistance across the back is normal in a close cut; restriction that does not release in a neutral stance is not.
How much room should you leave for what you wear underneath?
Only as much as the layer you actually wear demands — fit the jacket over the heaviest thing you will really put under it, not the thickest thing you own. A cut fitted over a tee will not accept a shawl-collar knit.
The rule that keeps you out of trouble: size for the shoulders, layer within what the chest allows. Going up a size to fit a sweater buys chest room and a shoulder seam in the wrong place.
Some cuts solve this for you. Shearling is a sheepskin tanned with the wool left on, so the insulation sits inside the pattern: a piece like the Artico Shearling is drafted around wool a lambskin biker has no room for.
What is the correct fit for each type of jacket?
Every cut has its own idea of correct, and the differences sit in chest ease and hem position rather than in the shoulder. Read the table as you would read a jacket: shoulder, then chest, then length.
| Cut | Shoulder | Chest ease | Length | Layer beneath |
|---|---|---|---|---|
| Biker | On the corner, no drop | Close — flat hand, no more | Top of the hip | Tee or fine knit |
| Cafe racer | On the corner, no drop | The closest of the cuts | Shortest — waistband | Tee or shirt |
| Bomber | On the corner or marginally out | Relaxed, tapering to the band | Band on the hip bone | Shirt or fine knit |
| Leather blazer | Clean, tailored, no divot | Moderate — shirt plus fine knit | Covers the seat | Shirt, fine knit |
| Trucker / field | On the corner, slight ease | Roomier and squarer | At the waistband | Shirt and knit |
| Aviator / shearling | On the corner; bulk inside | Generous — the wool takes the room | Hip length | Knitwear |
| Coat | On the corner; sets the whole line | Closes over a heavy knit | Above, at or below the knee | Knitwear or a second layer |
Read it by column: the shoulder never moves, the chest opens as the cut moves outward, the hem migrates downward. The same logic runs through the men's jackets and the women's jackets, with the waist drafted higher on the women's cuts.
How does leather change shape over time?
Leather moulds; it does not resize. Body heat and movement relax the fibre structure where the jacket is repeatedly flexed — elbows, back, the front of the shoulder — so it gradually stops fighting your posture. Circumference eases a little. Length does not.
Speed depends on the skin. Soft lambskin softens within weeks and takes a set quickly, which is why a lambskin biker such as the Perla Biker should be chosen close rather than comfortable — comfortable now becomes loose later. Full-grain calfskin — hide with its dense outer surface left intact, marks included — works in over months: firmer on the first day, closer to your own shape after a few seasons. Waxed cowhide is slowest.
One consequence for sizing: a jacket slightly tight in the chest may come right. A jacket tight in the shoulders never will.
What should you do if you are between two sizes?
Take the size that fits your shoulders. If both clear them, let the cut decide — smaller for a biker or cafe racer, larger for a bomber, trucker, shearling or coat.
- Does the shoulder seam land on the corner in both sizes? If only one does, the decision is already made.
- What goes underneath, honestly? A tee-only jacket can afford the smaller size; one that must clear a wool knit cannot.
- Which leather is it? Between sizes in soft lambskin, the smaller size usually arrives where you wanted it. In calfskin or cowhide, what you buy is close to what you keep.
Every jacket we make is cut to order in XS to XXL, so answer the layering question first. Each product page carries a 360-degree view — use it to read hem placement and waist shaping, the two things a straight-on photograph hides, and work through the full collection with the table above in hand.
The short answer
- The shoulder decides the size. The seam belongs on the outer corner of your shoulder, and nothing is worth trading for it.
- Fit it closed. A flat hand between chest and leather, no creases fanning from the zip, no collar lifting as you reach.
- Leather eases around, never along. Chest and waist relax with wear; sleeve and body length stay as bought.
- Each cut has its own correct. Cafe racers and bikers end at the waist; bombers, shearlings and coats are drafted for a layer.
- Between sizes, go by shoulders and skin. Lambskin forgives the smaller size; calfskin and cowhide keep you honest.