What makes a good coat fabric
A coat has to do a few jobs at once: hold in warmth, block wind, cope with moisture, and keep its shape. No single fabric is best at all of these, so the right choice depends on the climate and how you plan to wear it. Fabric weight, weave density, and what is used for the lining and insulation all affect the result as much as the fibre itself.
Wool and wool blends
Wool is widely seen as the classic choice for winter coats. The fibres trap air, which helps with insulation, and wool can absorb some moisture without feeling wet right away. It also drapes well and holds a tailored shape. Wool blended with a little nylon or polyester is common, and can add strength and reduce cost. Heavier, tightly woven wool tends to block wind better than loose knits.
Cashmere, tweed and boiled wool
- Cashmere (compared with everyday fibres in cashmere vs cotton) is a soft, fine fibre prized for light warmth. It is usually more expensive and often needs careful care, so it is more often blended with wool.
- Tweed is a rough, sturdy wool cloth with a textured look, suited to country-style and heavier coats.
- Boiled wool is a knit that has been felted, giving a dense fabric that resists wind reasonably well and does not fray.
For more on wool grades and weaves, see our article on types of wool fabric for suits, which applies to coat cloth in many ways too.
Cotton twill, canvas and gabardine
Tighter cotton weaves are used for trench coats, mac coats and mild-weather jackets. They are breathable and sturdy but are not usually very warm on their own. Waxed cotton adds water resistance, though it needs occasional re-treatment. Gabardine, a tightly woven twill that can be cotton or wool, is the traditional trench coat cloth.
Nylon and polyester
These synthetics are the base of most technical rainwear and puffer coats. They are lightweight, dry quickly and handle wet weather well, especially with a waterproof coating or membrane. They breathe less than wool or cotton (our guide to whether nylon is good or bad weighs the trade-offs), so a coat made entirely of synthetics can feel clammy during activity.
Down-filled and fleece options
Many puffer coats use a nylon or polyester shell over down or synthetic insulation. Fleece, a polyester fabric, is often used as a mid layer or lining. These choices focus on warmth for their weight rather than a tailored look.
Which is warmer: cotton or polyester?
It depends on the construction. Thickness, the amount of trapped air and how well the coat blocks wind matter more than the fibre alone. Polyester fleece or insulation is often warmer than a thin cotton coat, while a heavy cotton canvas might be warmer than a thin polyester shell. Cotton also holds moisture and can feel cold when wet, which is one reason it is less common for cold, wet conditions.
Fabrics to be cautious with
- Thin, single-layer cotton in genuinely cold weather.
- Very lightweight polyester without insulation, which may not give much warmth.
- Loose knits that let wind straight through.
- Fabrics that pill or fray quickly, which can make a coat look worn early (see fabrics that don’t pill).
Don’t forget the lining
The lining affects comfort, ease of putting the coat on, and warmth. Read our guide to the best lining fabric for coats for details. If you are choosing coat fabrics as part of a broader wardrobe, our guide to fabric for men’s clothes gives a wider overview.