Why the Weave Matters as Much as the Fibre

When we talk about a winter suit or overcoat, the conversation usually begins and ends with fibre: wool, cashmere, alpaca, the odd bit of silk for lustre. All well and good, but it misses half the story. The way those fibres are interlaced — the weave — determines how the cloth drapes, how much warmth it holds, how it creases, how it recovers, and how it looks from three feet away versus across a room.

Summer cloth wants to be open and porous, letting air move through. Cold-weather cloth wants the opposite: a denser interlacing, yarns with more twist or more bulk, and a surface that traps still air against the body. Get the weave right and a 350g suit can feel warmer than a poorly considered 500g one. Get it wrong and you will spend the season either shivering or feeling like you are wearing a duvet to the office.

Here is how the three great weaves of the colder months — twill, herringbone and flannel — actually behave, and where each earns its place in a wardrobe.

Twill: The Reliable Backbone of Winter Tailoring

Twill is defined by its diagonal. The weft passes over one or more warp threads and under the rest, stepping across the cloth to create those familiar raised lines. Because the yarns sit close together, twill is dense, hard-wearing and surprisingly good at shrugging off wind. It also drapes cleanly and holds a press beautifully, which is why it has been the default for business suiting for well over a century.

Within the family there is real variety. A steep, tightly woven gabardine makes a superb raincoat. Cavalry twill, with its bold double rib, is the classic riding and country trouser. A plain 2/2 worsted twill is the workhorse of the city suit.

For autumn and winter, look for a worsted twill in the region of 300–380g. Navy, charcoal, mid-grey and deep olive all work hard. One caution: twill can carry a faint sheen on the face. On an evening suit this is an asset; on a casual jacket it can read a little sharp. If you want softness, choose a slightly rougher finish.

Herringbone: Texture That Whispers

Herringbone is a twill with a change of mind. The diagonal reverses every few threads, producing the V-shaped zigzag that gives the weave its name. Technically it is usually a broken 2/2 twill, and that broken rhythm is what makes it so useful.

From across a room, a grey herringbone reads almost as a plain grey. Up close, it is full of movement and depth. That quietness is its great virtue — it adds interest without ever shouting, which makes it ideal for odd jackets, country tailoring and any suit that needs a bit of character while remaining entirely professional.

Weight and scale matter enormously. Around 300–400g suits a jacket; 450–500g and above belongs on heavier country coats. A small, tight herringbone leans formal; a large, bold one leans rustic. Herringbone in a woollen-spun tweed is softer and fuzzier, while a worsted version is sharper and smoother. Both are excellent — just match the cloth to the garment rather than the other way round.

Flannel: Softness, Warmth and a Touch of Romance

Flannel is not strictly a weave at all. It is a finish, usually applied to a twill or plain weave, in which the cloth is brushed or lightly milled to raise a nap. Woollen flannel is carded rather than combed, giving that fuzzy, matte, slightly cloudy surface we recognise instantly.

What you get for your money is warmth without weight. The raised nap traps air, so a 300g flannel feels considerably warmer than a 300g worsted. It drapes softly, forgives a multitude of figure quirks, and hides creases in a way that twill simply cannot. A heavy grey flannel suit is one of the great quiet pleasures of dressing.

Weights of roughly 280–330g make a lovely winter suit; 400–500g flannel is best kept for trousers or a substantial sport coat. Light grey, mid-grey, charcoal, navy and cream are the classic shades, and a chalk stripe on flannel is a perennial favourite. Be aware that flannel creases more readily, can pill with friction, and dislikes heavy rain. Press it gently, always with a cloth and plenty of steam, and never scrub the nap.

Choosing Between Them: A Practical Guide

• City suits: a 320–350g worsted twill in navy or charcoal. It holds its shape through a long day and looks correct in any meeting room.
• Country and weekend tailoring: herringbone, particularly in a tweed. The texture softens formality and pairs naturally with knitwear and brogues.
• Winter trousers: flannel, especially in grey. Warm, comfortable, and the nap gives the colour a depth that plain cloth lacks.
• Overcoats: a heavy twill or melton is more weather-resistant and will serve you better on wet commutes. Flannel overcoats are glorious but want dry days and careful handling.
• Odd jackets: herringbone and flannel both shine here. Twill is a touch more formal, so keep it to a simple colour and a slightly rougher hand.

Above all, handle cloth before you commit. Photographs flatter everything, and the difference between a good twill and a great one is something your fingertips will detect long before your eyes do.

A Word on Caring for Heavier Cloth

Cold-weather cloth rewards a little discipline. Rest your garments between wears — a day off the hanger lets wool recover its shape. Brush with a soft bristle brush to lift dust, and air jackets near an open window rather than reaching for the dry cleaner. Flannel benefits especially from a broad wooden hanger and a gentle hand. Spot-clean where you can, dry-clean sparingly, and when flannel does need pressing, make sure whoever does it knows to work with the nap rather than against it. Looked after properly, a well-chosen winter cloth will outlast the trend that prompted you to buy it.