Cotton Knitwear Sourcing: Types, Blends and What Buyers Should Specify

By YZR Sweaters · 2026-09

Cotton is where most knitwear programmes make their margin and their volume. It carries spring and summer ranges, it works in markets that never really have a winter, and it can sit at price points that wool cannot reach. It also behaves differently from wool in ways that matter commercially — it is heavier, it shrinks more, it has less natural elasticity — so a cotton range specified from a wool template usually disappoints.

Which cotton types are used in knitwear?

Cotton is not one fibre, and the differences between types show up in the finished garment. The main ones a buyer will meet:

• Standard or common cotton. The workhorse, grown and spun in many origins. The right choice for volume programmes where cost matters more than fibre fineness.
• Long-staple cotton such as Supima or extra-long-staple types. Longer fibres spin into a smoother, stronger, more lustrous yarn, which shows up as a softer hand and less pilling. The usual choice for premium cotton knitwear.
• Organic cotton. Grown to an organic standard and certified through the supply chain, usually GOTS for the finished garment. It carries a premium and appeals to specific buyers rather than being a general upgrade.
• Combed versus carded. Combed cotton has had short fibres and impurities removed before spinning, producing a cleaner, smoother, stronger yarn. Carded is rougher and cheaper.
• Mercerised cotton. Treated with caustic solution to swell and straighten the fibre, giving a silkier surface, better lustre and improved dye uptake. Common in higher-end knitwear and in bright colours where standard cotton looks flat.

The general fibre landscape is covered in our sweater yarn guide, and the certification route for organic cotton in our notes on recycled and organic fibres.

Which cotton blends make sense in knitted garments?

Pure cotton knitwear has real limitations — it is heavy, it has almost no natural stretch, and it can sag — which is why blends dominate. The blends a buyer should understand:

• Cotton and polyester. Lower cost, better dimensional stability and faster drying, at the price of a slightly synthetic hand feel. The standard blend in volume programmes.
• Cotton and viscose or modal. Softer drape and a cooler feel, with improved recovery over pure cotton. Common in better womenswear.
• Cotton and linen. A spring and summer knit with texture and a dry hand. Wrinkles more, which some buyers want and others reject.
• Cotton and wool. Warmer than pure cotton with a better hand, and a good option for shoulder seasons where a wool sweater is too much.
• Cotton and elastane. Small additions — usually two to five percent — give stretch and recovery, which matters for fitted knit tops and ribbed styles.

A blend change is not a substitution that can be waved through. It moves weight, shrinkage behaviour and price together, and it has to be re-approved as a specification decision — the process our notes on yarn substitution describe.

Why does cotton shrink, and how is it controlled?

Cotton fibres swell and relax when wet, and any tension built into the yarn during spinning and knitting is released in the first wash. That is why a cotton sweater can come out of the machine noticeably smaller than it went in, and why shrinkage is the most common quality complaint on cotton knitwear.

Two levers control it. The first is the yarn: a combed, well-spun yarn with even twist holds its dimensions more predictably than a loose, low-twist one. The second is the finishing route — cotton knitwear is usually washed, compacted or pre-shrunk so that most of the movement happens before the garment reaches the customer. Specifying a maximum shrinkage figure, tested to a named standard, is what makes the requirement enforceable. Our notes on controlling shrinkage explain the mechanisms.

A related trap is the hem and body length. A loosely knitted cotton sweater can grow under its own weight on a hanger, so the length measured on the flat sample is not necessarily the length a customer sees a month later. Check it on a hung sample rather than a flat one.

How does gauge change a cotton sweater?

Gauge does more work in cotton than in wool, because cotton has no natural crimp to bulk the fabric. A fine-gauge cotton knit — 12 to 16 gauge — produces a smooth, relatively dense fabric that holds its shape and sits well under a jacket, which suits polos, fine tops and summer-weight sweaters. A coarser gauge produces a heavier, more textured fabric with more air trapped, which reads as a cooler-weather piece.

The relationship between gauge, fabric weight and warmth is the same physics our warmth guide describes, and the gauge numbers themselves are explained in our notes on knit gauge.

What should a cotton knitwear spec include?

• Cotton type and staple. Standard, long-staple, organic or mercerised, plus combed or carded. These are the decisions that set the ceiling on hand feel.
• Blend percentages with a tolerance. A range rather than a single figure, given that spinning and blending produce small variation. Our yarn guide covers fibre naming.
• Gauge and target fabric weight. Both together, so hand feel and weight are pinned down. Our notes on fabric weight and GSM explain how the two relate.
• Maximum shrinkage, tested to a standard. The single most valuable line in a cotton specification.
• Colourfastness requirements for washing, perspiration and light. Cotton takes dye differently from wool and bleeds more readily in strong colours, which our notes on colour fastness cover.
• Pilling and abrasion expectations. Cotton pills less than wool but a loose, low-twist yarn will still pill, and the test should be named. See preventing pilling.
• Care instructions that match the tested behaviour. A cotton knit sold as machine washable has to be tested that way, or the first domestic wash becomes a returns problem.

How does cotton compare with wool commercially?

Cotton is generally cheaper at the same quality level, which makes it the practical way to reach lower price points and volume programmes. It is also the easier sell in warm and transitional markets and in countries where wool is regarded as an occasional purchase rather than a staple. Where it loses is warmth for weight, luxury perception and longevity — a well-made wool sweater outlasts a cotton one.

The common pattern in a well-built range is to use cotton for the volume and the warmer months, wool and wool blends for the core winter pieces, and to let the two sit side by side with clear price steps. Our notes on range planning cover how many styles and price points that balance implies.

At YZR Sweaters we work with partner factories holding BSCI, SEDEX and Oeko-Tex certifications, welcome factory audits, and support third-party inspection through firms such as SGS and BV. For cotton programmes we specify the fibre type, combed or carded, gauge and shrinkage limit up front, because those four lines decide what the garment actually feels like in a customer's hands.

Frequently asked questions