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Fabric quality comes down to five measurable specifications: cotton staple length (short-staple is under 25 mm, extra-long staple is 35 mm and up), wool fibre diameter in microns (fine merino 17–19, crossbred 21–25), weave structure, weight in g/m², and blend ratio — 5% or less of a synthetic fibre is a functional addition, 20% or more is cost-cutting that dilutes the natural fibre.
What changed?
- October 18, 2026: Added the six published sources behind the figures on this page, a section on what elastane actually contributes at 2–5%, and a section on what mercerisation changes in a cotton shirt.
- September 25, 2026: Opened with a numeric summary of the four specifications worth demanding, and added two self-contained passages: one on fabric weight in g/m² and how it converts from oz/yd², one on how thread count is actually counted and why the figure is inflated.
Fabric quality shows up in numbers before it shows up in a photo: cotton staple length under 25 mm or over 35 mm, wool fibre diameter from 17 to 25 microns, linen weight from 5 to 10 oz/yd², and a thread count the seller may be counting twice over. The four specs below — fiber length, weave, weight, and finish — decide how a garment survives a year of washing.
A shirt that looks crisp in a listing photo can still pill, fade and lose its shape within three washes, because a photograph carries colour and pattern and nothing else: not fibre length, not weave density, not the finish the mill applied. The sections that follow give you the questions to ask and the details to look for before ordering.
Fabric Weight in GSM: The Spec Sellers Cannot Dodge
Fabric weight is the one specification a seller can quote without opinion, and mill spec sheets give it in grams per square metre (g/m²) rather than the ounces per square yard printed on many English-language labels. The two units convert on a fixed factor of 33.9: 5 oz/yd² is about 170 g/m², 7 oz is about 237 g/m², 8 oz is about 271 g/m², and 10 oz is about 339 g/m². Weight is the fastest read on how a cloth will behave on the body — a 170–240 g/m² fabric falls softly and reads as summer shirting, while anything past roughly 340 g/m² stands away from the body and belongs on a jacket rather than a shirt. That is the number to request in both units: a seller reading from a mill spec sheet has both, a seller working from memory will offer “medium weight” instead.
Cotton: Thread Count Is Not Everything
Cotton is the most common clothing fabric, but its quality varies enormously based on fiber length, yarn spinning method, and weave.
Fiber Length: Long-Staple vs. Short-Staple
Cotton fibers range from short (less than 25mm) to extra-long staple (35mm+). Longer fibers produce smoother, stronger, and more lustrous yarn because there are fewer fiber ends on the surface.
- Extra-long staple (ELS): Egyptian cotton, Pima cotton, Sea Island cotton. The highest quality — smooth, durable, resists pilling.
- Long-staple: Upland cotton with 28–34mm fibers. Good quality, standard for mid-range shirts.
- Short-staple: Below 25mm. Prone to pilling and fuzzing. Common in cheap mass-market clothing.
What to ask in a catalog: “What is the cotton staple length?” or “Is this Pima/Egyptian/ELS cotton?” If the seller only says “100% cotton,” it is likely short-staple upland.
Weave Types
| Weave | Characteristics | Best For |
|---|---|---|
| Plain (broadcloth) | Smooth, flat, slightly crisp | Dress shirts, formal |
| Oxford | Basket-weave, textured, durable | Casual to smart-casual |
| Twill | Diagonal lines, drapes well, resists wrinkles | Dress shirts, chinos |
| Sateen | Smooth, lustrous surface, less durable | Luxury shirts, linings |
| Flannel | Brushed surface, soft, warm | Cold weather shirts |
Thread Count
Thread count (threads per inch) matters but only within the same yarn quality. A 120-thread-count shirt made from long-staple cotton will outlast a 200-thread-count shirt made from short-staple cotton.
Thread count is counted along only two sides of a single square inch — the lengthwise warp threads and the crosswise weft threads — and the two numbers are added together, so a shirting quoted at 150 count holds roughly 75 yarns in each direction. That arithmetic is why the figure inflates so easily: a cloth woven from 250 two-ply yarns per direction can be sold at 1,000 thread count if every ply inside each yarn is counted as its own thread. Accepted practice, set out by the National Textile Association and citing ASTM International, is to count each thread as one however many plies it contains, and the US Federal Trade Commission has agreed that inflated counts may mislead buyers. Read a thread count as a marketing figure sitting on top of yarn quality, not as a grade in itself.
- 80–120: Casual, breathable, less formal
- 120–160: Standard dress shirt range
- 160–200: Fine dress shirts, smoother surface
- 200+: Luxury range, but only meaningful with ELS cotton
Wool: Grade, Micron, and Weave
Wool quality is measured in microns — the diameter of individual fibers. Lower micron counts mean finer, softer wool.
Wool Grades by Micron
| Grade | Micron Range | Feel | Use |
|---|---|---|---|
| Fine merino | 17–19 | Very soft, next-to-skin | Luxury sweaters, suits |
| Medium merino | 19–21 | Soft, slight texture | Good sweaters, mid-range suits |
| Crossbred | 21–25 | Slightly scratchy | Coats, heavier knitwear |
| Carpet wool | 25+ | Coarse | Rugs, heavy outerwear |
What to ask: “What micron count is the wool?” or “Is this merino?” If the label says “wool” without specifying merino, it is likely crossbred — coarser and less comfortable.
Wool Weave Types
- Worsted: Combed to remove short fibers, producing a smooth, hard-finish fabric. Used for suits and trousers. Holds crease well.
- Woollen: Carded but not combed, producing a softer, fuzzier fabric. Used for sweaters and blankets.
- Tweed: Heavy woollen weave with a rough texture. Used for coats and country clothing.
Super Numbers (S120, S130, S150)
The “Super” number on wool suiting refers to the fineness of the yarn in microns. S100 ≈ 18.5 microns, S120 ≈ 17.5, S150 ≈ 15.5. Higher numbers mean finer, smoother fabric but also more delicate and prone to shining at friction points.
Practical advice: S100–S130 is the sweet spot for business suits. Above S150, the fabric is too delicate for daily wear.
Linen: The Summertime Standard
Linen is made from flax fibers. It is highly breathable, absorbs moisture well, and has a distinctive texture with natural slubs (thick and thin spots in the yarn).
Quality indicators:
- Fiber origin: Belgian and French flax are considered the best — longer fibers, smoother yarn.
- Weight: Measured in ounces per square yard. 5–7 oz is lightweight (summer shirts); 8–10 oz is medium (trousers); 10+ oz is heavy (jackets).
- Slub character: Natural linen has irregular slubs. If the fabric is perfectly even, it may be a cotton-linen blend or a lower-quality short-fiber linen.
What to ask: “Is this 100% linen or a blend?” Linen-cotton blends are cheaper and less prone to wrinkling but lose the distinctive drape and breathability of pure linen.
Blends: What You Gain and Lose
Blends combine fibers to balance properties — but they also dilute the best qualities of each fiber.
| Blend | Pros | Cons |
|---|---|---|
| Cotton-polyester (60/40) | Wrinkle-resistant, cheaper | Less breathable, pills over time |
| Wool-polyester (70/30) | Holds shape, durable | Loses drape and breathability |
| Linen-cotton (55/45) | Less wrinkling, softer | Less breathable than pure linen |
| Cotton-elastane (97/3) | Stretch, better fit | Elastane degrades with heat |
General rule: Blends with 5% or less of a synthetic (like elastane) are functional improvements. Blends with 20%+ synthetic are cost-cutting measures that compromise the natural fiber’s best qualities.
Two Percent Elastane, and What It Does to the Other Ninety-Eight
A 97% cotton / 3% elastane shirt is not a slightly stretchy cotton shirt: the stretch comes entirely from the elastane, a polyether-polyurethane fibre invented in 1958 by Joseph Shivers at DuPont that can stretch to about five times its own length and return to its shape. Because it works at that ratio it is almost always the minority fibre, blended with cotton or polyester in a small percentage, which is why the cloth keeps the look and hand of the natural fibre rather than reading as synthetic. By 2010 an estimated 80% of clothing sold in the United States contained some. The number to ask for is therefore the percentage, not the word “stretch”: in the same twill weave 2% and 5% give visibly different amounts of give, and heat in the wash is what shortens the fibre’s working life.
That is also why “stretch cotton” tells you nothing about the cotton. Read the two numbers separately — the fibre content, then the percentage — and treat a fabric with 5% elastane as a different product from one with 2%, even when both are labelled the same way.
What Mercerisation Changes in a Cotton Shirt
Mercerisation is a finishing treatment for cellulose fabric — mainly cotton and flax — that runs the cloth through a caustic soda bath of roughly 20–26% concentration, usually while the fabric is held under tension. John Mercer devised the process in 1844 using 20–30% sodium hydroxide, and observed that the cloth shrank while its tensile strength and its affinity for dye rose. The silk-like lustre the word now implies was not part of his version: it came in 1889, when Horace Lowe applied tension during the treatment. Three effects are measurable in wear — deeper dye uptake, higher tear strength, and less shrinkage in the wash. What it does not change is the fibre length, so a mercerised short-staple cotton can take colour beautifully and still pill at the cuff within a season. The finish and the fibre are two separate specifications, and a seller who mentions one is not describing the other.
How to Assess from Catalog Photos
Since you cannot touch the fabric, look for:
- Surface texture: Smooth, tight weaves suggest higher thread count. Fuzzy or uneven surfaces suggest shorter fibers.
- Drape: How the garment hangs in the photo — stiff drape suggests heavier or lower-quality fabric.
- Sheen: A subtle sheen on cotton suggests mercerisation (a chemical finish applied under tension that improves strength and luster). A plastic-like shine suggests high synthetic content.
Then ask the seller for: fiber content, weight (gsm or oz/yd²), origin of the fiber, and whether the fabric has been pre-shrunk and color-fast tested.
Sources for the figures in this guide
| Reference | What it establishes |
|---|---|
| Units of textile measurement | Thread count counted along the warp and weft of one square inch and added, the two-ply inflation that turns 250 yarns per direction into a four-figure count, the National Textile Association position citing ASTM International, and the US Federal Trade Commission view that inflated counts may mislead |
| Cotton | Upland cotton (G. hirsutum) at about 90% of world production, and extra-long-staple G. barbadense at over 5% — the reason “100% cotton” without a staple length is most likely upland |
| Merino | Merino generally under 24 microns, with the published bands: strong 23–24.5, medium 21–22.9, fine 18.6–20.9, superfine 15–18.5, ultra-fine 11.5–15 microns |
| Linen | Linen as the bast fibre of the flax plant, up to three times stronger than cotton, and drying faster than cotton |
| Spandex | Elastane stretching to about five times its length, the 1958 Shivers/DuPont origin, the small-percentage blend with cotton or polyester, and the estimate that 80% of US clothing sold in 2010 contained some |
| Mercerisation | The 1844 Mercer process at 20–30% sodium hydroxide, the 20–26% caustic soda range in modern use, the 1889 Lowe tension step that produces the lustre, and the dye-uptake, tear-strength and shrinkage effects |
Figures on this page were checked on 18 October 2026. Where a specification is printed as a range by the source, the range is reproduced rather than averaged, and the bands the trade publishes for wool are kept separate from the coarser buyer-facing names (fine merino, crossbred, carpet wool) used further up this guide.
For more on coordinating materials across accessories, see our accessory pairing guide.
Frequently asked questions about fabric specifications
- What fabric weight in g/m² should a shirt be?
- Roughly 170–240 g/m² reads as shirting: 5 oz/yd² is about 170 g/m² and 7 oz is about 237 g/m², and cloth in that band falls softly and hangs rather than standing away from the body. 8 oz or about 271 g/m² is the top end for a heavier shirt, and past roughly 339 g/m² (10 oz/yd²) the cloth behaves like jacket material. Ask for the figure in both units, because a mill spec sheet prints both and a seller working from memory will answer "medium weight".
- Is a 1,000 thread count real?
- It can be real arithmetic and still mean very little. Thread count is counted along only two sides of one square inch — the lengthwise warp and the crosswise weft — and the two numbers are added, so a shirting quoted at 150 holds roughly 75 yarns in each direction. A cloth woven from 250 two-ply yarns per direction can be sold at 1,000 if every ply is counted as its own thread. Counting each thread once, the practice the National Textile Association sets out citing ASTM International, keeps the figure comparable.
- What micron count should a wool suit be?
- Fine merino sits around 17–19 microns and crossbred around 21–25, so a suit cloth described only as "wool" is the coarser end. Merino as a breed is generally under 24 microns, and the published bands run strong 23–24.5, medium 21–22.9, fine 18.6–20.9, superfine 15–18.5 and ultra-fine 11.5–15 microns — which is why the number, not the word merino, is the specification worth asking for.
- How much elastane is in a stretch shirt?
- Usually a small percentage: a 97% cotton / 3% elastane shirt carries the stretch in those 3 points. Elastane is a polyether-polyurethane fibre that can stretch to about five times its own length, which is why so little of it changes the whole hand of the cloth. Ask for the percentage rather than the word "stretch", because 2% and 5% behave differently in the same weave, and remember that heat is what shortens the fibre's life.
- Does mercerised cotton last longer?
- It measurably improves three things: dye uptake, tear strength, and shrinkage. Mercerisation runs cellulose fabric through a caustic soda bath of roughly 20–26% concentration, usually under tension, and the treatment leaves cotton taking dye more deeply, tearing less readily and shrinking less in the wash. The silk-like sheen most people associate with the word comes from the tension applied during the process, not from the soda alone. It does not lengthen the cotton fibre, so a short-staple mercerised shirt can still pill.