Ask any tailor to name the single greatest suiting fabric in the world, and the answer will be the same: wool. For centuries, wool has been the foundation of fine tailoring — and for good reason. It drapes beautifully, breathes naturally, resists wrinkles, holds its shape, and lasts for years. No other fabric combines all of these qualities so completely.
But “wool” is not one single thing. There are different types, different weaves, different weights, and a confusing system of “Super numbers” that leaves many people unsure what they are actually buying. Understanding wool is the key to choosing the right suit — one that suits your climate, your use, and your needs.
At The Alex Fashion House in Karon, Phuket, wool is one of the cornerstones of our tailoring. This is the complete guide to wool — the types, the weaves, the Super numbers, and how to choose the right one.
Why Wool Is the World’s Best Suiting Fabric
Before the technical details, it is worth understanding why wool has been the tailor’s fabric of choice for so long.
It breathes. Wool is naturally breathable, allowing air to circulate and helping regulate temperature — keeping you comfortable across a range of conditions.
It drapes beautifully. Wool has a natural drape and body that allows it to hang cleanly and follow the shape of a well-cut suit — the foundation of an elegant silhouette.
It resists wrinkles. Wool naturally springs back from creasing, meaning a wool suit looks sharp through a long day and recovers its shape when rested.
It holds its shape. Wool has a natural memory that helps a suit retain its form over time — and, in canvassed construction, mould gently to the wearer’s body.
It’s durable. A quality wool suit, well cared for, lasts for many years — one of the most durable natural suiting fabrics.
It’s versatile. From lightweight tropical wools to heavy winter weights, wool spans every climate and occasion.
These qualities together are why wool remains, centuries on, the benchmark against which all other suiting fabrics are measured.
Understanding “Super Numbers”
The most confusing aspect of wool for most people is the “Super” number — Super 100s, Super 120s, Super 150s, and beyond. Here is what it actually means.
The Super number refers to the fineness of the wool fibre. The higher the number, the finer and thinner the individual wool fibres, and the smoother, softer, and more lustrous the resulting fabric.
- Super 100s–110s — a robust, practical fineness. Durable, hard-wearing, and excellent for everyday and business suits.
- Super 120s–130s — the sweet spot for most quality suits. Noticeably finer and softer, with a good balance of luxury and durability.
- Super 150s–160s — very fine, soft, and luxurious, with a beautiful lustre. More delicate, best for suits worn occasionally rather than daily.
- Super 180s and above — extremely fine and luxurious, but delicate. Reserved for special-occasion suits worn rarely.
The Key Misunderstanding
Many people assume a higher Super number is always better. This is not true. A higher Super number means a finer, more luxurious fabric — but also a more delicate one. A Super 180s suit feels wonderful but creases more easily and wears out faster than a Super 120s.
For most people, Super 110s to 130s is the ideal choice — luxurious enough to look and feel excellent, durable enough to wear regularly and last for years. Reserve the very high Super numbers for occasional, special-occasion suits.
Worsted vs Woollen: The Two Main Types
Wool fabric is made in two fundamentally different ways, producing two different types of cloth.
Worsted Wool
Worsted wool is made from long fibres that are combed to lie parallel, then tightly spun and woven. This produces a smooth, fine, durable fabric with a clean surface and a subtle sheen.
Best for: Business suits, formal suits, and most tailored suiting. Worsted is the standard for sharp, smooth, formal suits — the majority of quality suits are worsted wool.
Characteristics: Smooth, durable, wrinkle-resistant, holds a crease well, refined appearance.
Woollen (Woolen)
Woollen fabric is made from shorter fibres that are not combed parallel, producing a softer, fuzzier, more textured and insulating fabric.
Best for: Casual jackets, tweeds, flannels, and colder-weather garments. Woollen fabrics are warmer, more textured, and more casual.
Characteristics: Soft, textured, warm, insulating, more casual appearance.
In short: worsted for smooth, formal, business suits; woollen for textured, warm, casual jackets and cold-weather wear.
Wool Weight: Choosing for Your Climate
Wool is woven in different weights, measured in grams per metre (or ounces per yard). Weight is one of the most important factors in choosing a wool suit for your climate and use.
Lightweight wool (7–9 oz / ~210–270g) Cool, breathable, and ideal for warm weather and summer. Tropical-weight and high-twist wools fall here. Best for hot climates, summer, and travel.
Mid-weight wool (9–11 oz / ~270–330g) The versatile all-rounder — comfortable across most seasons and the most practical choice for a year-round business suit in temperate climates.
Heavyweight wool (11+ oz / ~330g+) Warm, structured, and durable, with an excellent drape. Best for cold weather, winter suits, and cooler climates.
For warm climates like Phuket: lightweight or tropical-weight wool (or a wool blend) is the right choice — cool and breathable in the heat. For year-round or cooler climates: mid-weight wool is the versatile standard.
Tropical Wool: The Hot-Weather Secret
Here is a fact that surprises many people: wool can be an excellent hot-weather fabric.
“Tropical wool” (also called high-twist or “fresco” wool) is woven with a looser, more open structure and a high-twist yarn that allows air to pass through freely. The result is a wool fabric that is remarkably cool and breathable — combining wool’s excellent shape-holding and wrinkle-resistance with the airflow needed for hot weather.
For those who need the sharpness and structure of wool in a warm climate — a business suit in the tropics, for example — tropical wool is an outstanding choice. It stays sharper than linen, breathes far better than standard wool, and delivers a formal look in the heat. (See our hot weather dressing guide.)
Types and Sources of Wool
Merino wool — from Merino sheep, prized for its fine, soft fibres. Most quality suiting wool is Merino. Exceptionally soft, breathable, and comfortable.
Vitale Barberis Canonico — Italy’s oldest woollen mill (founded 1663), renowned for consistent quality and durability. A benchmark suiting wool. (See our fabric guide.)
Dormeuil — a prestigious British cloth house (founded 1842) producing some of the world’s finest wools, often blended with cashmere, silk, or rare fibres.
Wool blends — wool blended with other fibres for specific properties: wool-linen and wool-linen-silk for breathability and warm-weather elegance; wool-cashmere for softness and luxury; wool-mohair for a crisp, lightweight finish with sheen.
Caring for Wool
Wool is durable and easy to care for with a few key practices:
- Rest between wears — never wear the same wool suit two days running; let it recover its shape for at least a day
- Brush after wearing to remove dust and surface dirt
- Steam rather than dry clean to refresh and remove creases
- Dry clean sparingly — only a couple of times a year at most, as the chemicals wear on the fibres
- Hang on a proper shaped hanger to maintain the jacket’s structure
- Protect from moths in storage with cedar
(For the full guide, see our suit care guide.)
How to Choose the Right Wool for Your Suit
Putting it all together, here is how to choose:
For a versatile year-round business suit: Mid-weight worsted wool, Super 110s–130s, in navy or charcoal. The reliable, hard-wearing, sharp choice.
For a warm climate or summer suit: Lightweight or tropical (high-twist) wool, or a wool-linen blend. Cool, breathable, and sharp in the heat.
For a special-occasion suit: A finer wool (Super 150s+) or a luxury blend (wool-cashmere, Dormeuil), for softness and lustre — worn occasionally rather than daily.
For a cold-climate or winter suit: Heavyweight wool, or a woollen fabric like flannel, for warmth and structure.
For a casual jacket: Woollen fabrics — tweed, flannel — for texture, warmth, and character.
At The Alex Fashion House, our team advises on exactly the right wool — type, weight, weave, and Super number — for your climate, use, and preferences.
Frequently Asked Questions
What does the “Super” number mean in wool?
The Super number refers to the fineness of the wool fibre — the higher the number, the finer, smoother, softer, and more lustrous the fabric. Super 100s–110s is robust and practical; Super 120s–130s is the ideal balance of luxury and durability for most suits; Super 150s and above is finer and more luxurious but more delicate, best for occasional-wear suits.
Is a higher Super number always better in a wool suit?
No. A higher Super number means a finer, more luxurious fabric — but also a more delicate one that creases more easily and wears out faster. For a suit worn regularly, Super 110s–130s is the ideal choice, offering luxury and durability. Very high Super numbers (150s and above) are best reserved for special-occasion suits worn occasionally.
What is the difference between worsted and woollen wool?
Worsted wool is made from long fibres combed parallel and tightly woven, producing a smooth, fine, durable fabric ideal for business and formal suits. Woollen wool is made from shorter fibres that are not combed parallel, producing a softer, more textured, warmer fabric ideal for casual jackets, tweeds, flannels, and cold-weather wear. Most quality suits are worsted wool.
Is wool good for suits in hot weather?
Yes — the right wool can be excellent in hot weather. “Tropical wool” (high-twist or fresco wool) is woven with an open structure that allows air to pass through, making it cool and breathable while retaining wool’s shape-holding and wrinkle-resistance. Lightweight wool and wool-linen blends are also good warm-weather choices. Only heavy worsted wool is unsuitable for heat.
What weight of wool suit should I buy?
For a versatile year-round business suit in a temperate climate, choose mid-weight wool (around 9–11 oz). For hot climates and summer, choose lightweight or tropical wool (7–9 oz) or a wool blend. For cold climates and winter, choose heavyweight wool (11+ oz). Weight is one of the most important factors in matching a wool suit to your climate.
What is merino wool?
Merino wool comes from Merino sheep and is prized for its fine, soft fibres. It is the source of most quality suiting wool, valued for being exceptionally soft, breathable, and comfortable against the skin. Most fine wool suits are made from Merino wool.
What is the best wool for a suit?
For most people, a mid-weight worsted Merino wool in Super 110s–130s is the best all-round choice — luxurious, durable, sharp, and versatile. For specific needs, choose lightweight or tropical wool for heat, heavyweight for cold, finer wool or luxury blends for special occasions, and premium cloth houses like Vitale Barberis Canonico or Dormeuil for the finest quality.
Does The Alex Fashion House offer a range of wool fabrics?
Yes. The Alex Fashion House offers an extensive range of wool fabrics — including pure wool, tropical and lightweight wools, and premium cloth from houses like Vitale Barberis Canonico and Dormeuil, as well as wool blends. Our team advises on the right type, weight, weave, and Super number for your climate, use, and preferences, and tailors every garment to your exact measurements.
The Fabric That Defines Fine Tailoring
Wool has been the foundation of fine tailoring for centuries because nothing else matches its combination of drape, breathability, resilience, and durability. Understand the types, weights, and Super numbers, choose the right wool for your climate and use, and you have the foundation of a suit that looks sharp, wears well, and lasts for years.
At The Alex Fashion House, we craft suits in the finest wools from the world’s best cloth houses — advising on exactly the right choice for you, and tailoring every garment precisely to your body.
📍 560 Karon, Mueang Phuket District, Phuket 83100
📧 info@thealexfashionhouse.com
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