Why wool is used for suits
Wool is the traditional suiting fibre. Its natural crimp traps air, it can absorb some moisture, it recovers well from creasing, and it can be spun and woven into a wide range of weights and textures. Different wool fabrics behave quite differently, so “wool suit” covers a lot of ground. If you are weighing it against alternatives, see wool vs cotton suits, or our broader comparison of wool or cotton.
Worsted vs woollen
These two terms describe how wool is processed, not the animal it comes from.
- Worsted: the fibres are combed so they lie parallel and are spun into a smooth, fine, strong yarn. The cloth is smooth and crisp with a clean surface. Most business suits are worsted.
- Woollen: the fibres are carded rather than combed, giving a fuzzier, loftier yarn. Cloths such as flannel and tweed are typically woollen-spun, which makes them softer and warmer but less sharp-looking.
Note that the word “worsted” is sometimes used differently in other contexts, such as for a yarn weight in knitting, so it helps to read the label carefully.
Merino wool
Merino sheep produce a fine fibre that feels soft against the skin. Many quality suit cloths use merino wool (see pima cotton vs merino wool for how it compares with a premium cotton), and it is common in both worsted suiting and lighter travel cloths. “Merino” describes the breed and fibre fineness, not the type of weave.
Flannel
Flannel is a soft wool cloth with a lightly brushed surface. It is a good fit for autumn and winter suits because it feels warm, though it can wear down faster than a smooth worsted and may show wear at stress points.
Tweed
Tweed is a rugged, heavier wool cloth with a textured, often flecked look. It is better suited to jackets and country-style suits than to formal business wear, and it is a strong cold-weather option.
Tropical and fresco wool
Lightweight, open-weave wool cloths, sometimes called tropical or fresco, are made for warm climates. They use tightly twisted yarns to produce a cloth that feels dry and airy and wrinkles less than many cottons or linens.
Wool blends
Wool is often blended with other fibres. Small amounts of nylon can add strength, silk can add sheen, and linen can add texture and coolness. Polyester blends are cheaper and more wrinkle-resistant but often feel less breathable. Check the label so you know how much of the cloth is wool.
What are Super numbers?
Super numbers, such as Super 100s or Super 120s, are a grading system that relates to how fine the wool fibres are. Higher numbers generally mean finer fibres and a softer, smoother cloth. They do not directly measure quality or durability. Very high numbers can be more delicate and may wear out faster, so a higher number is not automatically better. For everyday suits, many people prefer a mid-range number for a balance of softness and durability.
Cloth weight
Weight matters as much as fibre. Lighter cloths feel cooler and suit summer or hot climates; heavier cloths feel warmer and may last longer in cold weather. A mid-weight worsted is the most flexible option for year-round wear in temperate climates.
Which type is best for you?
| Use | Common choice |
|---|---|
| Business, all-season | Mid-weight worsted |
| Hot climate | Tropical or fresco wool |
| Cold weather | Flannel, heavier worsted |
| Casual jackets | Tweed, hopsack |
| Travel | High-twist, wrinkle-resistant worsted |
FAQ
What type of wool is best for suits?
For most people, a mid-weight worsted merino is a dependable all-rounder. The right type depends on climate, budget and formality.
What is the difference between wool and wool blend?
A wool blend contains other fibres alongside wool. This can change cost, durability, drape and breathability. The label shows the percentages.
Can wool be used for blazers too?
Yes. Wool is also the standard choice for blazers; see our guide to the best fabric for a blazer. For a wider overview of men’s tailoring and casual fabrics, see fabric for men’s clothes.