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Substituting Yarn in a Pattern: What to Look For Before You Start

Written by: Nicky Crane
Updated: Oct 6, 2026

Balls of yarn in various colours (Photographer: Liana S)

One of the first questions every maker asks is whether they can swap the yarn a pattern calls for. The good news is that substituting yarn in a pattern is entirely possible, and it's a skill every beginner in knitting, crochet and weaving eventually picks up. Your chosen yarn might be unavailable, it might sit outside your budget, or you might simply fall in love with a different colour or fibre. Whatever the reason, understanding how to substitute yarn well will help you choose a replacement with confidence and finish a project you're proud of.

It's tempting to think that matching yarn weight is all you need to do. There's more to it than that, though. Fibre type, construction, drape, stretch, gauge, yardage and even colour all affect your finished project, so knowing what to check before you buy can save you time and spare you some frustration.

You don't need to find a yarn that's identical to the original. Instead, the goal is to pick a yarn that gives you a fabric similar to what the designer planned, or to choose something different if you're after a new look or alternative drape.

Why Substitute Yarn At All?

Patterns are often written around a specific yarn, but that doesn't mean you have to use it.

Makers commonly substitute yarn for these reasons:

The original yarn is no longer available, or isn't available locally
They already have potentially suitable yarn in their stash
Natural fibres appeal more than synthetics, or the other way around
A different colour palette catches their eye
Budget plays a part, and a more affordable yarn does the job just as well
Climate or comfort calls for a swap
Texture is something they want to experiment with

Many designers actually encourage substitution, because makers have different preferences and different access to brands depending on where they live. Whatever your reason, the goal when substituting yarn in a pattern is to keep the fabric, fit or feel the designer intended, or to deliberately change it.

Important Considerations When Substituting Yarn in a Pattern

Start with the pattern requirements.

Before you go looking for alternatives, read through the entire pattern first. Pay attention to the yarn weight, fibre content, total yardage or metreage, recommended gauge, number of skeins or cakes, and suggested needle, hook or reed size.

These details tell you far more than the brand name ever will. For example, if a shawl pattern calls for a lightweight wool blend with plenty of drape, using a stiff cotton instead will give you a very different result. Neither choice is wrong if you intend for the shawl to have more structure, but it helps to know how it will change the finished piece so the final result is intentional.

Yarn weight is your starting point when substituting yarn

The easiest comparison to make is yarn weight. The Craft Yarn Council's Standard Yarn Weight System groups yarn into categories from finest to thickest: lace, super fine (fingering or sock), fine (sport), light (DK), medium (worsted, afghan and aran), bulky, super bulky, and jumbo. For a more detailed explanation of standard yarn weights, refer to our full guide.

Choosing the same weight category usually keeps you on the right track, but weight alone is never the whole story. Even two yarns labelled as fingering weight can behave quite differently once you factor in fibre and construction.

Fibre content changes everything.

Fibre determines how a finished project feels, stretches, wears and drapes. Here are some common examples:

Wool is elastic, warm and forgiving. It blocks beautifully and often makes lace patterns shine.
Cotton has very little elasticity. It gives crisp stitch definition but tends to feel heavier than wool.
Linen softens with wear while keeping its beautiful drape. It has little stretch and can feel firm while you're working with it.
Silk adds shine, softness and luxurious drape.
Alpaca is warm and soft with lovely drape, although it lacks memory and can therefore stretch over time.
Mohair adds a soft halo and warmth. It also softens stitch definition, so intricate textures appear gentler.

Blended yarns combine several of these characteristics at once. If you'd like to learn more about different yarn types, our free guides cover this in more depth.

Yarn construction matters too.

Not every yarn is spun the same way. Consider whether the yarn is woollen or worsted spun, plied or single ply, chainette, brushed, bouclé, ribbon or tape. Construction influences stitch definition, durability, elasticity and even gauge. For textured knitting or crochet, a smooth-plied yarn often shows off a stitch pattern more clearly than a fluffy, brushed one will.

Always compare yardage

Many beginners compare only the ball's weight in grams, which can give you the wrong idea entirely. For example, 100g of one yarn may contain 400 metres, while another 100g may contain only 200 metres. Because patterns are written according to the total length of yarn required, always compare metres or yards rather than grams alone.

Gauge is the most important test.

If you only remember one thing about substituting yarn in a pattern, remember this: make a gauge swatch. Gauge determines whether your finished garment ends up the size it's meant to be, and even two yarns labelled identically can knit up to different tensions in your hands.

Swatching also lets you assess fabric drape, stitch definition, thickness, comfort and overall appearance. Taking a little extra time before you start can save a lot of disappointment later.

Consider the finished fabric.

Ask yourself what the project actually needs. A baby blanket benefits from softness and easy washing, a woven table runner needs stability, a lightweight summer top should stay breathable, and a winter jumper should provide warmth. The yarn you pick should suit the project's purpose just as much as it suits the pattern.

Colour behaves differently in different yarns.

Colour is something people often forget to factor in. Highly variegated yarn can hide complex stitch patterns, while solid colours tend to highlight texture. Gradients create smooth transitions that work beautifully in shawls and garments, and self-striping yarn behaves differently again.

When substituting yarn, consider whether the original sample relies on colour changes to achieve its visual impact, or whether the colour you'd like to use may hide design features rather than enhance them.

Pattern Spotlights: Substituting Yarn in a Pattern

Gardens of Giverny Shawl by Alina Appasova

The Gardens of Giverny Shawl by Alina Appasova is a graceful lace shawl featuring flowing motifs that resemble rippling water and garden pathways. The sample combines Malabrigo Sock in Arco Iris and Solis, a fingering-weight, 100% superwash merino yarn, creating a rich blend of hand-dyed colour and solid contrast that beautifully defines the lace pattern.