Most of what separates a sweater you keep for five winters from one you replace in March is visible before you buy it. Knowing how to tell if a sweater is good quality is a matter of looking at four or five specific things: the tightness of the knit, the finish at the seams, how the ribbing behaves when you stretch it, and the weight in your hand. None of it requires a label or a price tag. Here is what to check.
What material is a good quality sweater?
Fibre matters less than people assume, and construction matters more. Merino and lambswool are warm for their weight and recover shape well. Cotton is cooler and holds a crisp stitch but stretches at the elbow over time. Acrylic and acrylic blends have a poor reputation earned by cheap versions, yet a well-spun acrylic knit is light, holds colour, resists moths and does not shrink, which is why The Alpine Crewneck uses one. The question worth asking is not what the yarn is made of but how tightly it is spun. Hold the knit up to a window. If you can see clearly through the gaps between stitches, the yarn is thin, and the garment will only thin further.
The checks you can do in thirty seconds
Stretch the cuff and let go. Good ribbing snaps back flat; poor ribbing stays slightly open, and that is exactly how it will look after ten wears. Run a thumb along the shoulder seam from the inside — a finished, flat seam means the panels were joined properly rather than overlocked in one pass. Check the weight by picking the sweater up at the shoulders and letting it hang: a quality knit has enough mass to fall straight rather than cling to itself. Last, look at where the sleeve meets the body on both sides. A clean, symmetrical join means the panels were cut to the same pattern, which sounds obvious and often is not true.
Texture is a useful shortcut. A jacquard or patterned face, like the one on The Crewneck Knit, needs a denser stitch to hold the pattern, so a textured knit is rarely a thin one. The same logic applies to ribbed and cable constructions.
Does pilling mean bad quality?
Not on its own. Pilling happens when short fibre ends work loose and tangle under friction, and almost every knit does it somewhere in the first month — under the arms, along the sides, wherever a bag strap sits. What matters is whether it stops. A well-spun yarn sheds its loose ends and settles. A poorly spun one keeps producing them, because the fibre is short and the twist is loose. If a sweater is still pilling heavily after three or four washes, the yarn is the problem, not the wash. We covered how to stop a sweater from pilling separately if you already own one that is doing it.
How much should a good sweater cost?
There is no threshold price, but there is a pattern. Below a certain point the arithmetic stops working: yarn, knitting time and finishing all have a floor, and anything priced under it has cut one of the three. Above that floor, price tracks the name on the label more closely than it tracks construction. The useful approach is to compare two sweaters in the same price band using the checks above, rather than assuming the dearer one is better made. The Quarter-Zip Knit and The Vesper Sweater sit at different prices for reasons you can find in the hand — gauge, finishing, and the weight of the zip hardware — not because of where they are sold.
What good quality looks like a year later
The real test is not the shop floor. It is whether the shoulders still sit where they did, whether the hem still holds its line, and whether the colour has stayed even across the body. Most of that is decided by construction. Some of it is decided by you: a well-made sweater stored badly will lose its shape faster than an average one stored well. If you are building a knitwear rotation for the season, read how to store sweaters so they keep their shape next. It is the other half of this.
The full range sits in men's sweaters and women's sweaters, and there are short answers to more fit, fabric and care questions on Style Answers.