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Turn a suit jacket inside out and you will find two or three small tags: one at the inside breast pocket, one low in a side seam, one at the collar. Most men check the size and ignore the rest. That is a mistake, because those tags describe the two things you cannot judge from across a room, what the cloth is made of and how the jacket was built.
Reading them takes a minute once you know the vocabulary. Here is what each tag tells you, which numbers predict durability, and which words mean nothing at all.
The Three Tags Inside a Jacket
The Fiber Content Tag
Usually sewn into the inside breast pocket, sometimes at the back of the neck. Fibers are listed in descending order by weight, so the first name is the dominant one. A jacket marked 98% wool and 2% elastane is essentially wool with a little stretch built in. A fiber listed alone means the cloth is entirely that fiber.
The Care Label
Five symbols, standardised under ISO 3758: a washtub for washing, a triangle for bleaching, an iron for heat, a circle for professional dry cleaning, a square for drying. A single bar under the washtub means a mild cycle, two bars means very mild.
The Origin and Size Tag
Country of origin plus a size code. A 40R is a 40 inch chest in a regular length; 40S is short, 40L is long. Better jackets also print a drop number, the difference in inches between chest and waist. A size 40 jacket cut for a 34 inch waist is a 6 drop, and most suits sit at 6 or 7.
What the Fiber Percentages Tell You
The fiber line is the most useful information on the jacket and the one most shoppers skim.
Wool and Super Numbers
The number after "Super" comes from the old Bradford yarn count, which measured how many 560 yard hanks of yarn could be spun from one pound of wool. Finer yarn, higher number. In practice it tracks fiber diameter: Super 100s runs about 18.5 to 19.5 microns, Super 130s around 16.5 to 17, Super 150s around 15.5, and Super 180s under 15.
Finer cloth is softer and presses cleaner. It is also weaker, wrinkles faster, and wears through at the cuffs sooner. For a suit you wear three days a week, Super 100s to 130s is the sensible band. Save 150s and above for occasional wear. If crease recovery matters more to you than softness, this guide to wrinkle-resistant suit jackets covers the weaves that hold their shape through a full day.
Weight Matters More Than the Super Number
Ask what the cloth weighs, or read it off the tag. Seven to eight ounces (roughly 200 to 240 gsm) is summer weight, usually with an open weave you can see daylight through. Nine to ten ounces (270 to 300 gsm) covers three seasons in most climates. Eleven to thirteen ounces (340 to 400 gsm) is winter cloth, and flannel at that weight is the warmest option. A Super 150s in 7 oz will crease in an hour; a Super 100s in 11 oz will look sharp all day. If you are building for cold months, this comparison of wool suit jackets for cold weather shows how weight changes the drape.
Blends and What They Buy You
Elastane at 2 to 5 percent adds stretch and recovery, which is what makes a slim cut wearable. Above 5 percent the jacket can start to bag at the elbows and seat. Polyester at 10 to 25 percent buys crease resistance and abrasion resistance, which is why travel suits use it, at the cost of breathability and a faint sheen. Linen breathes and wrinkles on purpose, and a linen-silk blend drapes better than either fiber alone.
Watch for recycled wool: shredded and re-spun from garment waste, so the fibers are short, and short fibers pill. For unstructured warm-weather jackets, the advice in this guide to cotton blazers for breathable comfort applies more directly than suit tailoring rules.
Lining and Interlining Clues
The lining is where factories save money quietly, and the label names it in plain text.
Lining Fibers
Viscose, also sold as rayon, is the default: breathable, smooth, affordable, and prone to shrinking slightly over years of dry cleaning. Cupro, a cuprammonium rayon, feels cooler against the skin, resists static, and costs more. Polyester lining is durable and slippery but traps heat, so a heavy jacket with one feels clammy by mid-afternoon. Acetate sits at the bottom: shiny, cheap, and quick to crack at the underarm seam.
Half-Lining and Unlined Jackets
A fully lined jacket has lining through the body and the sleeves. A half-lined jacket covers the shoulders and upper back only, leaving the lower back open, which runs cooler in summer but exposes the internal seams. Unlined and self-lined jackets use the shell fabric inside, which is cool and elegant and unforgiving, because every raw edge has to be finished properly. Turn the jacket inside out and look at the lower back.
Interlining and Canvassing
Interlining is the layer that gives a jacket its shape, and it is either sewn in or glued in. Fused jackets use adhesive, which is fast and cheap and can bubble after a few dry cleans. Half-canvas jackets carry a floating canvas through the chest with fused lower panels. Full canvas has a floating horsehair or camel hair layer throughout. Pinch the cloth just above the top button: if you can feel a third layer moving independently, there is canvas in the chest.
Construction Clues Worth Checking
The label tells you what the jacket is made of. Your hands tell you whether anyone cared.
Matching Patterns at the Seams
On a striped or checked jacket, the pattern should run continuously across the chest seam and line up on the pocket flaps. A broken stripe at a pocket welt, or a check that jumps at the center back seam, means the cutter was working fast.
Working Buttonholes and Pick Stitching
Functioning cuff buttonholes, sometimes called surgeon's cuffs, take longer to sew and usually indicate a better factory. They can also be added later by a tailor, so treat them as a hint. Pick stitching, the dotted line along the lapel edge, is meant to suggest hand work, though on most jackets today it is machine-sewn two millimetres from the edge for decoration. Look at whether the stitches are irregular, as hand work is, or perfectly uniform.
Shoulder, Lapel, and Sleeve Head
A soft, unpadded shoulder collapses slightly and suits casual jackets. A roped shoulder has a defined roll where the sleeve meets the body and reads more formal. Neither is better, but do not mix them: a roped shoulder on an otherwise soft jacket usually means one sleeve head was used for the whole line.
Country of Origin and What It Means
Origin is the most over-read line on any label. It records where the final substantial assembly happened, not where the wool was grown or woven.
What Made in Italy Actually Means
Cloth woven in a British or Italian mill can be cut and sewn in another country and carry that country's label, so a hang tag claiming Italian fabric is a claim about the mill, not the jacket. A well-cut jacket from a good factory using Italian cloth will beat a badly made Italian jacket every time, which is why origin only sets your expectations on price.
The Countries Worth Knowing
Italy for cloth and soft tailoring, Portugal and Spain for dependable mid-priced construction, Japan for precise finishing, Eastern Europe for solid factory sewing, and China, Vietnam, and India across an enormous range. Country is a starting point, not a verdict.
Our Top Picks
If you want to practise reading labels, these three are a reasonable starting point.
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A Sixty-Second Label Check
Run this sequence in the shop, in this order. It catches most of what a label can hide.
- Find the fiber tag. Read the first number. Under 90 percent wool on a business suit deserves a reason.
- Check the weight. Hold the cloth to the light. If you can read text through it, it is summer cloth, whatever the Super number says.
- Read the lining. Viscose or cupro is fine. Acetate means the budget went elsewhere.
- Pinch the chest. A third layer that moves independently means canvas. A single stiff slab means fused.
- Match the pattern. Check the chest seam and one pocket flap against the body cloth.
- Read the care symbols. If it says dry clean only and you will not, put it back.
A mid-priced jacket with good cloth and a canvas chest beats a fused jacket at twice the price, and these affordable sports coats show what is realistic at that level.
Label Claims Versus Reality
Some label language is regulated and some is marketing. Here is the practical translation.
| What the label says | What it usually means | What to verify |
|---|---|---|
| 100% wool | All wool, with no grade stated | Super number and cloth weight |
| Super 150s | Very fine, relatively delicate fiber | Whether you will wear it weekly |
| Made in Italy | Final assembly happened in Italy | Where the cloth was woven |
| Fully lined | Lining through body and sleeves | Lining fiber and seam finishing |
| Half canvas | Canvas in the chest, fused below | The pinch test above the top button |
| Hand finished | Some hand operations, undefined | Irregular pick stitching, working cuffs |
| Travel suit | High-twist wool or a polyester blend | Crease recovery when you crush a sleeve |
Common Mistakes
Five errors account for most bad suit purchases made with good intentions.
- Reading the Super number as a quality score. A Super 180s jacket worn twice a week wears out before a Super 110s one.
- Ignoring the lining. Polyester inside a wool jacket turns a breathable garment into a plastic bag from the inside out.
- Assuming the country is the verdict. Origin tells you where the sewing happened, not how well it was done.
- Buying a fused jacket for heavy rotation. Adhesive fails after repeated dry cleaning and shows as bubbles across the chest.
- Skipping the care label. A jacket that needs dry cleaning after every wear costs more across its life than one that does not.
Frequently Asked Questions
What does Super 120s mean on a suit label?
It describes the fineness of the wool yarn, meaning the fibers average roughly 17.5 to 18.5 microns. It indicates softness, not durability.
Is a higher Super number always better?
No. Higher numbers mean finer, softer fiber that also wrinkles more and wears faster. For regular office wear, Super 100s to 130s is more practical than Super 150s or above.
How can I tell if a jacket is fused or canvassed?
Pinch the cloth just above the top button and try to separate the layers. A third layer that moves independently means a canvas chest; a single stiff slab that will not separate is fused.
Does made in Italy mean better quality?
Not on its own. It means the final assembly took place in Italy, and the cloth may have been woven elsewhere. Judge the jacket on fiber, weight, lining, and canvas instead.
What lining is best in a suit jacket?
Viscose or cupro for most climates, because both breathe and drape well. Cupro costs more and feels cooler. Avoid acetate, and think twice about polyester if you run warm.