Why knitwear behaves differently
Woven and jersey garments hold their shape because the fabric is stable. Knits are made of interlocking loops, which means they stretch, drape and recover. That makes them comfortable and, in the context of oopbuy clothes, unusually forgiving: a sweater that is 2 cm off in the chest will usually still fit, because the knit gives.
It also makes them the category where fibre content matters most. Two sweaters that look identical can be wool, acrylic or a blend, and the difference shows up in warmth, pilling and how they age.
Fibre: what you are actually buying
Wool
Warm, breathable, naturally odour-resistant. It can be itchy depending on the micron count, and it felts if washed hot. Merino is finer and softer but more expensive. A wool sweater is the best long-term purchase in knitwear.
Acrylic
The most common budget knit. Light, soft, holds colour well, and cheap. It pills more than wool and is less warm for the weight. A good acrylic sweater is fine for a season or two; it will not last a decade.
Cotton knit
Cool, breathable, machine-washable. Good for spring and summer sweaters. It stretches more than wool and can lose shape at the cuffs if hung wet.
Blends
Often wool with a small percentage of nylon for strength, or acrylic with cotton for softness. Blends are usually a reasonable compromise, but read the percentages: "wool blend" with 5 percent wool is an acrylic sweater.
| Fibre | Warmth | Pilling | Care |
|---|---|---|---|
| Wool | High | Low to moderate | Cool hand wash, dry flat |
| Merino | High | Low | Cool wool cycle, dry flat |
| Acrylic | Moderate | High | Machine wash cool, low heat |
| Cotton knit | Low to moderate | Low | Machine wash cool, dry flat |
| Wool blend | Varies with % | Moderate | Follow the dominant fibre |
Gauge and weight
Two numbers describe a knit. Gauge is how many stitches per inch: a fine-gauge knit is thin and smooth, a chunky gauge is thick and textured. Weight is the fabric weight, usually in gsm, and predicts warmth.
- Fine gauge, 180–220 gsm: a light layer, good under a jacket.
- Medium gauge, 240–320 gsm: the classic sweater. Wearable indoors and out.
- Chunky, 400+ gsm: an outer layer in its own right. Bulky to ship.
Chunky knits are the bulkiest item in a clothing parcel and compress poorly under mild vacuum packing, because the loft is the point. If you are shipping a chunky sweater, plan the parcel around it the way you would around a jacket.
Fit and the drop-shoulder question
Sweaters are usually cut in one of three ways: regular with set-in sleeves, relaxed with dropped shoulders, or oversized. The dropped shoulder is the most common source of confusion, because it makes the sleeve measure longer and the body look wider than the chart suggests.
Measure a sweater you own across the chest, flat, and compare. If the chart is within 2 cm, take it: knit stretches. If you want a fitted look on a relaxed cut, size down; if you want the intended look, buy your measurement.
Check body length as well, especially for cropped styles, which have become common. A cropped sweater needs a higher-rise bottom to work, and that is a wardrobe decision, not just a sizing one.
Necklines and what they do
- Crew — the default. Works under a jacket collar without competing.
- V-neck — lengthens the neck, needs a shirt or tee underneath in most cases.
- Mock neck — warmth without bulk; sits well under outerwear.
- Turtleneck — the warmest option; check the collar height in photos, because a loose one looks untidy.
- Cardigan — an extra layer that doubles as a light jacket. Check the button placket for gaping.
Pilling, and how to slow it
Pilling is small fibres tangling into balls on the surface. It happens most on acrylic and on loosely spun wool, and it is worse where the garment rubs: under the arms, at the cuffs, across a bag strap. You cannot prevent it entirely, but you can slow it: wash less often, turn inside out, use a mesh bag, and dry flat. A fabric comb removes pills without damaging the knit.
Care that keeps the shape
- Never hang a wet knit. Water weight stretches the shoulders permanently.
- Dry flat, reshaped, on a towel away from direct heat.
- Fold, do not hang, in storage. Hangers stretch the shoulder line over months.
- Wash cool and use a wool cycle for wool. Hot water felts animal fibres.
- Store with cedar or lavender if moths are a problem in your climate.
QC checks for knitwear
- No pulled loops or snags on the surface.
- Cuffs and hem ribbing look even, not stretched.
- Buttons on cardigans are secure and the placket lies flat.
- Colour matches the option; knit dye lots can vary slightly.
- Size label matches your order.
If the listing is a wool blend, ask the agent to photograph the care label. It is the only reliable source for the fibre percentages. For the layer above, see the jacket guide; for the layer below, the tee guide; and for parcel planning, the list method.