A sweater is worth what its fiber line says it is worth, and almost nothing else on the label matters. Anything at 80% wool or above is a buy under $50. Anything described as wool-rich at 40% is acrylic with a marketing department, and it will pill, sag and hold the smell of the previous owner exactly like acrylic. US labels must list each fiber at 5 percent or more by name and percentage, so the number is there to read.
Knitwear is the cheapest good fiber in the secondhand market, because wool is heavy to post, hard to photograph and unfashionable for half the year. That combination keeps a Pringle lambswool crewneck at $28 while the identical garment in a current-season shop sits at $220. Every price in this piece is a purchase price under $50.
Read the fiber line before the brand
Turn the sweater inside out and find the care label at the side seam. It carries a composition line, and that line is the only specification that survives the shop. Read it in this order: wool percentage, then the secondary fiber, then the country of manufacture. A brand tells you what someone paid; the fiber line tells you what you are buying.
The fiber line, translated
| Fiber line | What it means | Under $50 verdict |
|---|---|---|
| 100% wool, lambswool or Shetland | Dense, holds shape, resists odor | Buy. $22–$42 is normal |
| 80–95% wool, rest nylon or polyamide | The nylon is in the cuffs and collar for strength | Buy. $18–$35 |
| 70% wool, 30% acrylic | Softer hand, will pill at the underarm | Buy only at $15 or less |
| 50% wool, 50% acrylic | Acrylic is doing the structural work | Skip unless the pattern is exceptional |
| Wool-rich, 30–40% wool | A marketing term, behaves like acrylic | Skip |
| Cashmere touch, wool-free | Acrylic with a soft finish | Skip |
Two lines are worth memorizing. Lambswool is the first fleece from a young sheep and is softer and shorter-stapled than adult wool, which means it pills more but feels better. Shetland is adult wool from a specific breed, coarser and almost indestructible, which is why a Shetland sweater from 1975 still looks new. Both are excellent at $30 and both are common. Merino is the fine end of the scale: Woolmark puts merino generally under 22 microns, against roughly 50 to 100 for a human hair.
Pilling: what it tells you about the yarn
Pilling is not a defect in itself; it is a consequence of short fibers working loose and tangling. The question is whether the pills brush off or whether the whole surface has gone fuzzy, because those are different problems with different solutions.
- Loose pills on a smooth surface — Harmless. Cashmere and lambswool pill through their first few wearings and then settle. An inexpensive cashmere comb removes them quickly and the sweater improves from there.
- An even fuzz across the whole body — The fibers have abraded and the yarn is thin. It will keep thinning at the underarm and the cuffs, which are the two places already under tension. Accept a fuzzed sweater only at a rock-bottom price.
- Bobbling at the underarm, cuffs and hem only — Abrasion in the places that rub, which means the sweater was worn hard rather than washed badly. Reducible with a comb, but expect it to return. This is the most common condition under $20.
- Matting, where the surface has felted — Someone washed wool in hot water. The fibers have interlocked permanently and no amount of combing restores the hand. Leave it on the rack whatever the price.
Moth damage: three signs, and which one is fatal
Moths eat wool for the keratin, not because a garment is dirty, and they work in the dark. You will not see the adults; you see what they left. Check under the arms first, then the inside of the fold at the waist, then hold the sweater against a bright window and look along the surface.
- Tracking — Surface grazing where fibers have been nibbled but no hole has opened. Survivable, and honest mending is rarely needed. Worth a discount off the asking price, and worth buying if everything else about the sweater is right.
- Tunnels — Threads eaten under the surface, usually following a line. These become holes within a season. Swiss darning holds them for years, but a good mender charges per repair, so buy cheap and budget for it.
- Holes with frass — Fine gray dust and a gritty feel around the damage means the larvae are active or recently finished. Fatal. The sweater will continue to degrade in your wardrobe, and the infestation can reach everything else you own.
Six sweaters worth buying under $50
The knitwear edit
Where mending is likely, the cost of it is named so you can do the addition yourself. Prices are shown only where we confirmed them on the brand or retailer page in Oct 2026.
Best valuePringle of Scotland
Lambswool crewneck
Pringle knitwear from the 1980s and 1990s is dense, plainly cut and still made in Scotland in most examples. Lambswool pills in the first month and then settles. Press the underarm seam flat with your thumb: if the yarn springs back, there is plenty of life left in it.
Search listings
Best fiberUnbranded Scottish
Cashmere crewneck, grade A
Grade A means the surface is even and the elbows have no thin patches. Hold it against a window: light passing through in uneven blotches means the yarn has already been abraded by a previous owner.
Search listings
Pendleton
Shetland wool sweater
Shetland wool is coarse enough to survive everything, which makes a secondhand one a genuinely low-risk buy. Look for the wool mark label inside the neck.
Search listings
Patagonia
Recycled wool sweater
Recycled wool is short-staple by definition, so these pill more than a lambswool crewneck and should be judged on the cuffs rather than the body. Worth paying the top of the band for, because the resale price holds and the garment is repairable through the brand's own service.
Search listings
St Michael
Lambswool cardigan, 1980s
The most underpriced knitwear in any British charity shop, because the St Michael label reads as supermarket rather than heritage. It was made by the same Scottish mills that supplied the expensive houses. Check the button placket for stretched buttonholes, which is the one thing that does not mend cheaply.
Search listingsLyle & Scott
Fair Isle sweater, 1970s
Fair Isle is stranded colorwork, which means any moth damage sits right where you can see it. Buy it only if the pattern is intact across the chest and one shoulder at most shows tracking.
Search listingsThe ladder: $12, $22, $32, $45
What each knitwear budget buys
| Budget | What it buys | What it will not buy |
|---|---|---|
| $12 | A lambswool cardigan from a flat-priced rack, an acrylic blend you will wear for one winter | Anything with a Shetland or cashmere label |
| $22 | A lambswool crewneck in a common size, a wool-rich cardigan with nylon at the cuffs | Cashmere without a flaw |
| $32 | A Shetland wool sweater, a Fair Isle in a small size, a Pringle crewneck | Grade-A cashmere |
| $45 | Grade-A Scottish cashmere, a Patagonia recycled wool sweater | Nothing much: this is the top of the column |
The $12 band is where acrylic lives, and it is worth being honest about it: a wool-free sweater at $12 is not a bargain, it is a rental. You will wear it for one winter, it will pill at the underarm, and it will not survive the second wash. Pay $22 instead and buy wool, or pay nothing and keep the shelf space.
Washing, de-pilling and storing
- 1
Freeze it for three days before it enters the wardrobe
A domestic freezer kills larvae and eggs that are already on the fiber. Bag the sweater, freeze it, then let it come to room temperature still in the bag so condensation does not re-damp the wool.
- 2
Wash in cold water with a wool detergent
Twenty degrees, no agitation, no wringing. Roll the sweater in a towel to take out the water and dry it flat on a mesh rack. Hanging a wet wool sweater is how shoulders become stretched, which is the one thing mending cannot fix.
- 3
Comb, do not shave
A cashmere comb or a soft bristle brush lifts pills away from the surface. A razor or a defuzzer cuts the fibers and accelerates the next round of pilling, which is why a combed sweater improves and a shaved one does not.
- 4
Store folded, with cedar or lavender
Never on a hanger, and never in a sealed plastic box, which traps damp. Cedar blocks and lavender bags deter adults; only the freezer and dry storage deal with what is already there.
Maintenance costs almost nothing and it is the reason a $28 lambswool crewneck wears better in year three than a $70 acrylic one did in month two. The arithmetic of the whole column rests on that: the cheapest knitwear is the knitwear made of a fiber that responds to care.
