Cashmere on cone: do I need to work it "double-stranded" to knit a sweater?

This is one of the questions we receive most often:

“I've seen you have cashmere on cones, but to hand-knit a sweater, perhaps at least two strands are needed?”

The short answer is: it depends on the yarn (count), the project, and the effect you want to achieve.
There's no "always two strands" rule. There are yarns ready to be worked with a single strand and yarns that are designed to be plied (worked with multiple strands).

Let's see how to understand this simply.

1) What does "one or two strands" mean?

When talking about "one strand" or "two strands," people are often confusing:

• Number of plies: how many thin threads are twisted together (1-ply, 2-ply, 3-ply…)

• Final thickness of the yarn (what you feel between your fingers and which determines needle/hook size and gauge)

Practical example:

• A 2-ply yarn can already be perfect for working with a single strand.

• A 1-ply yarn might be too thin for a sweater… or it might be perfect if you want a lightweight garment or if you work it with multiple strands.

So the right question isn't "do I need two strands?"
But: what thickness do I need for my sweater?

2) The thing that really matters: the count (Nm) and the gauge

To understand if cashmere on a cone is suitable for knitting "as is" or if it needs to be worked with multiple strands, you need to look at the count, often indicated as Nm (metric number).

In simple terms:

• The higher the Nm number, the finer the yarn

• The lower it is, the thicker the yarn

And most importantly: it matters whether it's described as plied (e.g., Nm 2/28, 2/13, etc.) or single.

Note: In mill cones, it's very common to find yarns designed for different machines and gauges, so it's normal to have to "build" the thickness by working with multiple strands.

3) When it makes sense to work with "two strands" (or more)

Working with 2 strands (holding two threads together while you work) is useful when:

• The yarn is too thin for the effect you want

• You want a more opaque sweater, with more "body"

• You want to change the hand/gauge without changing yarn

• You want to achieve a melange effect using two different colors (or the same color with slightly different dye lots)

• You want to increase the durability or compactness of the stitch

Typical example:

• You have a very fine cashmere (intended for thin knitwear) and you want a "real winter" sweater: 2 strands or 3 strands can be the solution.

4) When you DON'T need to "use two strands"

You don't need to double up if:

• The yarn is already a suitable thickness (e.g., for 3.5–5 mm needles depending on the case)

• You want a lightweight, elegant, not too heavy garment

• You are working on a project where drape and softness matter more than structure (soft cardigans, light sweaters, "draped" accessories)

Many cashmeres, even on cones, can be worked perfectly with a single strand: you just need to choose the correct count.

5) The golden rule: always make a swatch (and treat it)

The most important thing (and what prevents 90% of disappointments) is this:

✅ Make a swatch
✅ Wash/treat it as you will the finished garment
✅ Only then decide whether to use 1 strand, 2 strands, or change needles

Why?

• Cashmere (and stock yarns in general) can change after washing: hand, compactness, stitch definition

• Two different colors, even of the same item, can react differently

• The number of strands greatly influences: density, elasticity, consumption, final weight

So yes: sometimes you work with two strands, but not because "you have to."
You work with two (or three) strands when it's necessary to achieve:

• the ideal thickness

• the hand you want

• the right stitch definition

• the correct opacity and weight

If you want to avoid wrong purchases, the path is always the same: swatch + treatment.