Jacket Sizes
Jacket sizes use different systems — chest-based numbers with short, regular and long lengths for tailored jackets, S–XXL for casual coats, and different number scales in the US, UK and Europe. Enter your measurements to find your likely jacket size and see it converted across systems, then use the charts and fit checks below.
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Quick answer
Jacket size conversion: for men’s tailored jackets, the US/UK size is usually the chest size in inches, and EU/IT is US + 10. That means an EU 48 men’s jacket is about a US 38. Letter sizes vary by brand, but a US 38 is commonly S/M, while a US 48 is usually XXL.
Jacket size finder
Jacket & Suit Fit Kit
Printable men’s and women’s jacket size conversion charts, a measuring guide worksheet, a fitting-room checklist and a tailor alterations notes sheet.
- Men’s chart (PDF)
- Women’s chart (PDF)
- Measuring worksheet (DOCX)
- Fitting checklist (PDF, DOCX)
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Free printables
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Printable Men's Jacket Size Chart
Printable Women’s Jacket Size Chart
Printable Jacket Size Worksheet
Printable Jacket Fitting ChecklistMen’s jacket size conversion
Use this quick conversion for men’s tailored jackets; casual letter sizes are typical and can overlap by brand.
| EU / IT | US / UK | Chest | Letter |
|---|---|---|---|
| 44 | 34 | 34 in (86 cm) | XS |
| 46 | 36 | 36 in (91 cm) | XS/S |
| 48 | 38 | 38 in (97 cm) | S/M |
| 50 | 40 | 40 in (102 cm) | M/L |
| 52 | 42 | 42 in (107 cm) | L |
| 54 | 44 | 44 in (112 cm) | XL |
| 56 | 46 | 46 in (117 cm) | XL/XXL |
| 58 | 48 | 48 in (122 cm) | XXL |
| 60 | 50 | 50 in (127 cm) | 3XL |
| 62 | 52 | 52 in (132 cm) | 3XL |
How men’s jacket sizes work
Men’s tailored jackets — suit jackets, blazers and sport coats — are sized by chest measurement in inches plus a length. A 40R is for a 40-inch chest and regular height. Lengths are usually Short (under about 5 ft 8 in), Regular (about 5 ft 8 in to 6 ft), Long (about 6 ft 1 in to 6 ft 3 in) and Extra Long (taller). Europe and Italy use chest size plus 10 (a 40 becomes a 50), and UK sizes match the US. Suits are traditionally cut with a 6-inch “drop”: a 40 jacket comes with 34 trousers.
Men’s jacket size chart
| Chest (in) | US / UK | EU / IT | Casual letter (typical) |
|---|---|---|---|
| 34–35 | 34–36 | 44–46 | XS |
| 36–37 | 36–38 | 46–48 | S |
| 38–39 | 38–40 | 48–50 | M |
| 40–42 | 40–42 | 50–52 | L |
| 43–45 | 44–46 | 54–56 | XL |
| 46–48 | 46–48 | 56–58 | XXL |
| 49–51 | 50–52 | 60–62 | 3XL |
Casual jackets, parkas and outerwear often use letter sizes, and the chest ranges differ between brands. Outerwear is also cut roomier to fit over layers.
Women’s jacket size conversion
| US | UK | EU / DE | FR | IT | Letter |
|---|---|---|---|---|---|
| 0 | 4 | 30 | 32 | 36 | XS |
| 2 | 6 | 32 | 34 | 38 | XS |
| 4 | 8 | 34 | 36 | 40 | S |
| 6 | 10 | 36 | 38 | 42 | S |
| 8 | 12 | 38 | 40 | 44 | M |
| 10 | 14 | 40 | 42 | 46 | M |
| 12 | 16 | 42 | 44 | 48 | L |
| 14 | 18 | 44 | 46 | 50 | L |
| 16 | 20 | 46 | 48 | 52 | XL |
Women’s sizes vary widely between brands and countries, so these conversions are a starting point. Always check the brand’s own chart, which usually lists bust, waist and hip in inches or centimetres.
How to measure for a jacket
- Chest / bust: measure around the fullest part, under the arms and across the shoulder blades, keeping the tape level. Wear a thin shirt, not a jumper.
- Waist: around your natural waist, the narrowest part of your torso.
- Shoulders: across the back from shoulder point to shoulder point.
- Sleeve: from the shoulder point to the wrist bone with your arm relaxed.
- Height: without shoes, for choosing short, regular or long.
Ask someone to help if you can — measuring your own back is difficult — and keep the tape snug but not tight.
How a jacket should fit
- Shoulders — the seam sits at the edge of your shoulder; no divots or overhang. Shoulders are the hardest part to alter, so prioritise them.
- Chest — buttoned, the jacket lies flat without an X-shaped pull around the button.
- Sleeves — end at the wrist bone, showing about ¼–½ inch of shirt cuff.
- Length — a classic suit jacket covers the seat; modern cuts are a little shorter.
- Collar — sits against the shirt collar without a gap at the back.
- Movement — you can reach forward and raise your arms without the jacket riding up excessively.
Worked example
Daniel measures a 41-inch chest, a 35-inch waist and stands 5 ft 11 in (71 in). The size finder rounds his chest to 42 and gives a length of Regular: 42R, EU 52. His drop is 6 inches, so standard suits with 36 trousers should fit. In casual jackets he would usually take a Large. If a 42R feels loose in the chest but right in the shoulders, trying a slim-fit 42R or a 41R from a brand that makes odd sizes is the next step.
What alterations can fix
| Easy to alter | Hard or impossible to alter |
|---|---|
| Sleeve length (within limits) | Shoulder width |
| Waist suppression (taking in the sides) | Jacket length (only slightly) |
| Button position (slightly) | Chest that is too small |
| Letting out small seams | Collar and lapel shape |
Buy the jacket that fits your shoulders and chest, then have a tailor adjust the sleeves and waist.
Outerwear sizing
Coats and outdoor jackets are sized to go over other clothes. If you are between sizes, choose the larger size for coats you will wear over thick knitwear or a suit jacket, and the smaller size for shell jackets worn over thin layers. Check the product description for “relaxed”, “regular” or “slim” fit, and the size chart for the garment’s actual chest measurement, which should be several inches larger than your body chest for a coat.
Sizing for different jacket styles
| Style | Sizing tip |
|---|---|
| Suit jacket / blazer | Chest size plus length (40R); check shoulder width |
| Sport coat | Same as suits, often cut slightly roomier |
| Denim / trucker jacket | Letter sizes; fits close — size up for layering |
| Leather jacket | Fits snug at first and softens; do not size up too far |
| Bomber | Relaxed body, ribbed hem; usually true to letter size |
| Parka / down coat | Roomy by design; check garment chest measurement |
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Frequently asked questions
What is a size 48 jacket in US sizes?
For a men’s EU/IT 48 jacket, the usual US/UK size is 38. For women, an Italian 48 is typically US 12, while an EU/German 48 is typically US 18, so check which country’s scale the label uses.
Is a men's 48 jacket the same as XL?
If 48 is a US/UK tailored size, it means about a 48-inch chest and is usually XXL. If 48 is an EU/IT size, it converts to US/UK 38 and is closer to S/M.
What size jacket is a 42 inch chest?
In men’s tailored sizing, a 42-inch chest usually points to a US/UK 42 jacket, or EU/IT 52. Choose Short, Regular or Long separately based on height.
What does 40R mean?
A jacket for a 40-inch chest in regular length, for heights of roughly 5 ft 8 in to 6 ft.
How do I convert a US jacket size to EU?
For men’s tailored jackets add 10 (40 → 50). For women’s, EU/German is roughly US + 30 (US 8 → 38).
Is jacket size the same as chest measurement?
For men’s tailored jackets, approximately yes — the size is based on body chest in inches.
What is the drop in a suit?
The difference between jacket size and trouser waist, usually 6 inches.
Should a coat be a size up?
Often, if you will wear it over thick layers; check the brand’s chart.
Is my data stored?
No, it runs in your browser.