The Cashmere Connoisseur: What Separates the Sublime from the Subpar

Why Most Cashmere Isn't What You Think

That £80 crewneck folded on the high street table? It's cashmere, technically. So is the Loro Piana sweater at twenty times the price. The fibre comes from the same animal, yet the gulf in hand feel, longevity, and drape is enormous. Understanding what separates them is less about snobbery and more about knowing where your money actually goes.

The Anatomy of Fibre: Microns, Origin, and Grade

Any credible cashmere quality guide starts with micron count. The undercoat of the Capra hircus goat yields fibres between 14 and 19 microns in diameter. The finer the fibre, the softer the handle and the higher the grade. Anything above 19 microns veers into coarser territory and pills faster.

Grade A cashmere (14–15.5 microns, fibres at least 34–36mm long) is the gold standard. It's what Brunello Cucinelli and The Row use for their signature pieces. Grade B sits at 16–17 microns, still luxurious but with a slightly less refined hand. Grade C and below? You'll find it in fast fashion collaborations where the label says cashmere but the garment behaves like any other knit after three washes.

Geography matters, too. Mongolian cashmere remains the benchmark, thanks to harsh winters that produce finer, longer fibres. Inner Mongolian herds, in particular, yield the softest undercoat. Chinese cashmere dominates the market by volume, but quality varies wildly depending on region and processing standards. Scottish and Italian mills, meanwhile, have earned their reputations not for raw material but for spinning and finishing expertise that transforms good fibre into exceptional cloth.

Ply, Weight, and Construction: The Details That Endure

Ply refers to how many strands are twisted together before knitting. Two-ply cashmere is the sweet spot for most sweaters: substantial enough to hold shape, light enough to layer. Single-ply feels gossamer but can be fragile unless the fibre quality is impeccable (see: Hermès lightweight knits). Four-ply and above venture into outerwear and cold-weather staples, offering heft without bulk.

Weight is measured in grams per square metre (GSM). A 300 GSM sweater sits comfortably in the mid-weight category, suitable for autumn through spring. Anything below 200 GSM skews summery and sheer. Above 400 GSM, you're looking at chunky knits or coat-weight fabric.

Construction reveals itself in the details:

• Fully-fashioned knitting (each panel shaped during knitting, not cut from a larger piece) reduces waste and creates cleaner seams
• Linking, not overlocking, at shoulders and sides for a flatter, more durable join
• Ribbing that doesn't sag after a few wears, a sign of quality elastic and proper tension
• Colour saturation that remains even across the garment (cheaper dyeing processes leave streaks or fade unevenly)

Johnstons of Elgin, a Scottish mill supplying many luxury houses, uses a gentle washing process that removes short fibres before knitting, which drastically reduces pilling. Contrast that with garments where little white balls appear after a single wear.

Caring for Your Investment: The Long View

A well-made cashmere sweater should last fifteen years, minimum. This cashmere quality guide wouldn't be complete without the maintenance reality: hand wash in cool water with a dedicated cashmere shampoo (The Laundress makes one, as does Kookai), then lay flat to dry. Never wring. Never tumble dry.

Store folded, not hung. Hangers distort shoulders. Cedar balls deter moths better than naphthalene, and they won't leave that acrid vintage shop smell. If pilling does occur (it will, even on the finest knits, especially under arms and where bags rub), use a cashmere comb, not a disposable razor. The comb lifts pills without shearing fibres.

Repair small holes immediately. A discreet darn by a skilled reweaver is invisible and costs a fraction of replacement. Shops like Alterations Boutique in London or Madame Pauline in Paris can restore a beloved piece to its former glory.

What to Look for When You're Buying

Before you commit, run this mental checklist. Does the garment feel substantial in hand, or does it seem insubstantial and wispy? Check the label for fibre length and origin (reputable brands disclose this). Examine the seams: are they flat and even, or bulky and puckered? Rub the fabric gently between your fingers. If it pills immediately, walk away.

Price alone doesn't guarantee quality, but it's a reasonable proxy. A jumper under £150 is almost certainly cut corners somewhere, whether in fibre grade, construction, or finishing. Between £300 and £800, you're in the territory where craftsmanship and material justify the cost. Beyond that, you're often paying for brand cachet, which is fine if that's what you value, but the cashmere itself may not be measurably better.

The best pieces feel like a second skin, drape without clinging, and improve with age as the fibres relax and soften. That's the benchmark. Anything less is just expensive wool.