The Yarn StudioGUIDE · PROJECT YARN PICKS
Best yarn for cardigans
A cardigan hangs open, so the front edges do all the work. Button bands sag, fronts stretch, and the shoulders carry the whole weight of the fabric. The best cardigan yarns combine a bit of body with enough elasticity to keep those edges straight.
Short answer
Pick a plied wool or wool blend in DK to aran weight. Plied yarns keep button bands crisp and stop the fronts from drooping — the two things that make or break a cardigan.
Best weights: DK (3), Worsted (4) and Aran (4); Sport (2) for lightweight layering cardigans.
Best yarns and fibres
Match the weight category on the ball band first, then compare fibre behaviour. Every option below works — the right one depends on how the finished piece will be worn, washed, and stored.
Plied wool (3–4 ply construction)
DK to AranWhy it works: Round, plied yarns give structure so button bands stay flat and the fronts hang straight.
Watch out: Very tightly plied yarn can bias in stocking stitch; a swatch tells you quickly.
Wool / alpaca blend
DK to AranWhy it works: A soft halo and cosy drape for a coat-style cardigan you live in.
Watch out: Heavy and prone to lengthways stretch — keep the body shorter than you think.
Wool / silk blend
Sport to DKWhy it works: Elegant sheen and beautiful drape for a dressier, lighter cardigan.
Watch out: Silk has no memory; add a firmer button band or a ribbon facing.
Cotton / acrylic blend
DK to WorstedWhy it works: Washable, breathable, and stable — a practical choice for everyday and children's cardigans.
Watch out: Denser than wool, so a long cardigan gets heavy. Choose a shorter length or a looser gauge.
Tweed wool
DK to AranWhy it works: Grippy, rustic fabric that holds shape exceptionally well and looks great with plain buttons.
Watch out: Rougher against the skin and often hand-wash only.
Chunky wool blend
Bulky (5)Why it works: Fast to make and warm for a jacket-style outer cardigan.
Watch out: Weight pulls at the shoulders — use a steeked, seamed, or set-in construction for support.
How much yarn you need
Yardage for a plain, long-sleeved worsted-weight cardigan. Cardigans typically need a little more yarn than the equivalent pullover because of the button bands and front overlap.
| Size | Yards | Metres |
|---|---|---|
| Child (4–8 yrs) | 750–950 yd | 685–870 m |
| Adult XS–S | 1,100–1,400 yd | 1,005–1,280 m |
| Adult M–L | 1,400–1,750 yd | 1,280–1,600 m |
| Adult XL–2XL | 1,750–2,150 yd | 1,600–1,965 m |
| Adult 3XL+ | 2,150–2,600 yd | 1,965–2,375 m |
These are planning estimates, not a substitute for the yardage printed in your pattern. Always compare total yardage rather than skein counts when you swap yarn.
Before you cast on
- Hang your washed swatch with a weight overnight to see how much the fronts will grow.
- Choose buttons before knitting the band so the buttonhole size is right.
- Prefer seamed or set-in shoulders for heavy yarns — they carry the weight better.
- Work the band in a firmer gauge or a smaller needle than the body.
What to avoid
- Slippery, unplied single yarns for button bands — they stretch and never recover.
- Very drapey silk or bamboo in a long cardigan unless the pattern is designed for it.
- Fluffy mohair-only yarn if you want crisp edges and defined shaping.
Substituting from your stash
You may already own something that works. The Yarn Studio matches yarns by tension, weight category, and fibre family, and flags the ones sitting in your own stash — including whether you have enough yardage for the pattern.
- Not sure what a mystery ball is? Identify it from thickness, ply and a photo.
- Need to hit a pattern gauge? Use the gauge calculator to find weights that match.
- Swapping a discontinued yarn? Read how to substitute yarn in any pattern.
FAQ
What yarn stops a cardigan's button band from sagging?
A plied, elastic wool or wool blend. Plied construction resists stretching, and wool's memory pulls the band back into shape after wear. Working the band on a smaller needle and picking up roughly three stitches for every four rows also helps.
How much yarn do I need for a cardigan?
Around 1,100–1,750 yards (1,005–1,600 m) of worsted-weight yarn for a plain long-sleeved adult cardigan. Add 10–15% over the equivalent pullover to cover the button bands and front overlap.
Is DK or worsted better for a cardigan?
DK gives a lighter cardigan that layers under a coat; worsted is warmer and works up faster, and is the better choice for a jacket-style outer layer. Both are easy to source and well supported by patterns.
Can I crochet a cardigan in the same yarn as a knitted one?
Yes, but crochet fabric is thicker and uses roughly 20–30% more yarn for the same area. Go down a weight — or use a larger hook and an openwork stitch — if you want the drape of the knitted version.
Best yarn for other projects
- Best yarn for sweatersFor most sweaters, choose a springy wool or wool blend in DK, worsted or aran weight. Wool holds shape at the shoulders, blocks beautifully, and needs the fewest stitches per row for a garment you will finish.
- Best yarn for blanketsFor most blankets, use a soft washable acrylic, cotton, or superwash wool blend in worsted, aran, or bulky weight. Washability and dye-lot availability matter more here than luxury fibre.
- Best yarn for baby blanketsUse a soft, machine-washable yarn in DK or worsted weight: premium acrylic, cotton, or superwash merino. Choose a tightly spun, non-shedding yarn and a firm stitch pattern with no large holes.
- Best yarn for scarvesChoose the softest fibre you can afford: merino, alpaca, or a merino/silk blend in fingering to worsted weight. Nothing that scratches, whatever the price tag says.
- Best yarn for amigurumiUse a smooth, plied cotton or cotton blend in sport to worsted weight, worked on a hook one to two sizes smaller than the ball band suggests. Cotton gives sharp stitch definition and holds shape when stuffed.
Shop your stash first
Search by tension, weight and fibre — and see which matches you already own.
Open the substitute finderKeep going
Related guides
- Project Yarn PicksBest yarn for every projectWhich yarn to use for sweaters, cardigans, blankets, scarves and amigurumi — fibres, weights, yardage and pitfalls.
- CrochetBest yarn for crochetWhich yarn to crochet with by project — blankets, amigurumi, garments and accessories — plus hook pairings and how much extra yarn crochet uses.
- CalculatorYarn weight & gauge calculatorEstimate gauge from a yarn weight and needle size, convert a swatch to stitches per 10 cm, or enter a pattern gauge and find yarns that match.