Cashmere in rocca: devo lavorarlo “a due fili” per fare un maglione ai ferri?

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, don't you usually need at least two strands?”

The short answer is: it depends on the yarn (count), the project, and the effect you want to achieve.
There is no "always two strands" rule. There are yarns already prepared to be worked as 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 people talk about “one strand” or “two strands,” they are often confusing:

Number of plies: how many thin strands are twisted together (1-ply, 2-ply, 3-ply…)
Final thickness of the yarn (what you feel between your fingers and what determines needle/hook size and gauge)

Practical example:

A 2-ply yarn might already be perfect to work as a single strand.
A 1-ply yarn might be too thin for a sweater… or it might be perfect if you want a light 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) What really matters: the yarn count (Nm) and 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 the number, the thicker the yarn

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

Note: it's very common to find yarns on cones from knitting mills 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 strands 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 by 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 (designed for thin knitwear) and you want a "real winter" sweater: 2 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 (for example, for 3.5-5mm needles depending on the case)
You want a light, elegant, not too heavy garment
You are working on a project where drape and softness are more important than structure (soft cardigans, light sweaters, “draped” accessories)

Many cashmeres, even on cones, can be worked perfectly as 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 gauge
Two different colors, even of the same article, 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: