Most patterns name a yarn you cannot get, or do not want. Substituting is normal. Doing it well comes down to matching two numbers and understanding one material.
Match tension first
Tension is the only number that controls size. If the pattern says 20 stitches to 10cm and your yarn gives 17, every measurement in the pattern is wrong and no amount of care later will fix it.
Work a 10cm swatch in the stitch the pattern uses — not in plain stocking stitch if the pattern is textured. Wash and dry it the way you will wash the finished piece. Then count. If you are off, change needle size before you change yarn: a 0.5mm step usually moves tension by a stitch or two.
Then match metres per 100g
Two yarns at the same tension can still behave differently if one is much denser. Metres per 100g tells you how much fabric you get per gram, and it is also what tells you how much to buy. Ours:
- DK Ombre Multicolour — 300m per 100g
- Perfect Aran Ombre — 200m per 100g
- Dream Ombre DK — approx. 187m per 100g
- Pom Poms Soft Yarn — 50m per 100g
Substituting DK Ombre for Dream Ombre DK looks like a like-for-like swap — both are sold as DK. But one gives 300m per 100g and the other about 187m, so the same jumper needs noticeably more weight in Dream Ombre. Recalculate the metres; do not carry the ball count across.
Fibre is the part that surprises people
Weight and tension can match perfectly and the finished piece can still be wrong, because fibre decides how the fabric behaves. What is on our shelf:
- 100% acrylic (DK Ombre Multicolour, Perfect Aran Ombre) — hard-wearing, machine washable, holds colour, vegan. It has little natural spring, so ribbing relaxes over time and a heavy garment can grow while worn.
- 80% acrylic / 20% wool (Dream Ombre DK) — the wool adds warmth and some memory, so ribbing holds better. It also means the yarn is no longer animal-fibre free, which matters if you are making for someone who minds.
- 100% microfiber polyester (Pom Poms Soft Yarn) — very soft and light for its bulk, and it drapes rather than holding a shape.
- Cotton (Cotton DK Amigurumi) — no stretch at all, crisp stitch definition, and heavier than it looks. It is why this yarn is right for toys and wrong for a fitted sleeve.
The practical consequences:
- Swapping wool for acrylic in a fitted garment: expect the ribbing to give. Go down a needle size on the ribbing.
- Swapping acrylic for cotton in anything that needs to stretch over a head or a shoulder: don't, without rethinking the shaping.
- Swapping any of these into amigurumi: cotton closes up and hides the stuffing; acrylic and polyester are softer and more forgiving but show gaps more readily.
Colour changes behave differently too
Several of our yarns are ombré — the colour shifts along the strand. Swapping a solid for an ombré will not change the fit, but it will change the pattern: colourwork, cables and lace can disappear into a shifting background. Ombré shows best in plain stitch over a large area.
If you are working two balls of an ombré alternately to avoid a hard join, buy them together so they come from the same dye lot.
A checklist before you commit
- Swatch, washed, in the pattern's stitch. Tension matches.
- Metres per 100g compared, and the quantity recalculated from metres.
- Fibre checked against what the piece has to do — stretch, drape, hold a shape, survive washing.
- Enough bought in one order to cover the whole piece plus one ball.
Get those four right and a substitution is invisible in the finished object. Skip the first one and nothing else on the list will save it.
