Suit cloth, explained
Suit fabric guide: Super numbers, weight & mills
Three things decide how a suit cloth performs. The Super number (Super 100s, 120s, 150s) measures yarn fineness — higher is finer and softer, but past a point more delicate, not simply "better." Weight, in grams per metre, decides the season: lighter for summer, heavier for winter. Weave decides texture and durability. Almost all premium suiting comes from a handful of European mills — Vitale Barberis Canonico, Loro Piana, Reda and the like. Centi Sartoria builds made-to-measure suits in cloth from 33 such mills, factory-direct, in about ten working days.
Super 100s vs 120s vs 150s
| Super 100s | Super 120s | Super 150s | |
|---|---|---|---|
| Yarn fineness | ~18.5 micron — fine | ~17.5 micron — finer | ~16.5 micron — very fine |
| Feel | Crisp, robust | Soft with good body | Silky, luxurious |
| Durability | Most hard-wearing | Balanced | Most delicate — creases & wears faster |
| Best for | Daily business & travel | A versatile premium suit | Special occasions, showpieces |
| Relative price | Most accessible | Mid | Highest |
The Super "S" number follows the IWTO definition of yarn fineness — higher is finer, not necessarily more durable. Past Super 120s, longevity falls. Centi Sartoria sources across this whole range from 33 European mills.
Glossary
The cloth terms a brand or buyer meets when sourcing suiting.
- Super (S) number
- A measure of yarn fineness defined by the International Wool Textile Organisation (IWTO): Super 100s ≈ 18.5 micron, each step of 10 roughly 0.5 micron finer. A higher number means a finer, softer yarn — but also a more delicate cloth, so it is a measure of fineness, not overall quality.
- Worsted wool
- Wool spun from long, combed fibres into a smooth, fine yarn. Worsted cloth is what most suits are made from — crisp, with clear weave definition. Distinct from woollen cloth, which is fuzzier and softer (flannel, tweed).
- Cloth weight
- The weight of the fabric, given in grams per linear/square metre (or ounces). Lighter cloth (≈230–260g) suits spring and summer; mid-weight (≈270–310g) is year-round; heavier (320g+) is for autumn and winter and drapes more robustly.
- Two-ply (2x2)
- Cloth woven from yarns made of two strands twisted together, in both warp and weft. Two-ply cloth is more durable, holds shape better and resists creasing more than single-ply — a marker of quality suiting.
- Twill
- A weave with a diagonal rib (as in a classic worsted or gabardine). Twills drape well, resist wrinkles and are a workhorse of suiting. Plain weave and hopsack (a basket weave) are the other common structures.
- High-twist (fresco)
- Cloth woven from highly twisted yarns, often in an open weave, so it breathes and resists creasing. Fresco and other high-twist cloths are prized for hot-weather and travel suits.
- Open weave
- A more loosely woven cloth that lets air through, used for warm-weather suiting. Breathable but more prone to snagging than a tightly woven worsted.
- Mill
- The textile manufacturer that weaves the cloth. The prestige names in suiting — Vitale Barberis Canonico, Loro Piana, Reda, Drago, Dormeuil and others — are mills whose cloth defines the premium tier. Centi Sartoria works with 33 European mills.
Frequently asked questions
What does Super 100s mean in a suit?
Super 100s is a measure of the wool yarn's fineness, defined by the IWTO — roughly an 18.5-micron fibre. Each higher step (120s, 150s) is a finer, softer yarn. It describes fineness, not overall quality: a well-finished Super 100s can outlast and outperform a poorly chosen Super 150s.
Is a higher Super number better?
Not automatically. Higher Super numbers are finer and feel more luxurious, but they are also more delicate — they crease and wear faster. For a suit worn often, Super 110s–130s is usually the sweet spot. Save Super 150s and above for occasion wear.
What weight of suit fabric works year-round?
A mid-weight cloth of roughly 270–310 grams is the most versatile, comfortable across most of the year. Choose lighter (around 230–260g) for hot climates and summer, and heavier (320g and up) for winter, where it also drapes more cleanly.
What are the best suit fabric mills?
The prestige European mills include Vitale Barberis Canonico, Loro Piana, Reda, Drago and Dormeuil, among others. Their cloth defines the premium tier of suiting. Centi Sartoria works with 33 European mills, so a brand can build a real cloth story.
What is the most durable suit fabric?
A mid-weight, two-ply worsted in the Super 100s–120s range, ideally in a twill or high-twist weave, is the most hard-wearing. Lighter cloths and very high Super numbers feel finer but wear and crease faster.
Premium European cloth, factory-direct
Centi Sartoria builds made-to-measure suits in cloth from 33 European mills, factory-direct, from a one-piece minimum — for individuals, boutiques and brands.