Planning to knit a scarf? There is more to it than picking yarn off the shelf at the craft shop. A pattern helps, since it usually suggests suitable yarns, and a knowledgeable shop assistant can point you in the right direction.

But it is worth being able to work it out yourself.

Start with what the item has to do

Everything follows from this, and it eliminates far more options than it sounds.

Will it be worn against skin? Then softness overrides everything. Yarn that feels fine in your hands can be intolerable at the neck. Test it against your neck or the inside of your wrist.

Will it be washed often? Then it must be machine washable, whatever the label suggests you could do carefully. Anything requiring hand washing gets worn less.

Will it take hard wear? Socks, mittens and children’s clothes need something firmly spun, ideally with nylon in the blend. A soft single-ply will look lovely and wear through quickly.

Does it need to hold a shape or to drape? Wool is springy and holds structure – good for ribbing, cables, fitted garments. Cotton and silk are fluid and heavy, and they grow with wear.

Then the weight

Match the weight the pattern specifies. This is the number that determines whether the finished item comes out the right size at all.

Compare yardage rather than ball weight – two 100g balls can hold very different lengths depending on fibre.

Then colour

Last, from what is left after the other decisions. Choosing colour first and trying to make it work is how yarn ends up unused in bags.

Novelty yarns

Eyelash, bouclé, ribbon, ladder and fun-fur yarns cause more difficulty than anything else on the shelf, and they are frequently marketed at beginners, which is unfortunate.

The problems:

You cannot see your stitches. Which means you cannot count, cannot spot a mistake, and cannot fix one. For a beginner this is close to fatal.

They are hard to unpick. Textured yarns catch on themselves, and ripping back is genuinely difficult.

Gauge is unpredictable. An irregular yarn does not produce a consistent stitch size.

They date. A novelty yarn scarf looks very much of its moment.

If you want to use one, hold it alongside a plain yarn rather than alone. You get the texture with a stitch structure you can actually see and work with.

For a first scarf

Smooth, light-coloured, medium weight, soft, machine washable. Unglamorous and it will produce something you actually wear.