Fabric Grainline on Knit Fabrics: How to Cut Accurately and Avoid Distortion
Grainline. It's one of the most important concepts in cutting knit fabric. The direction you cut determines how a finished garment sits on the body, how it stretches during movement, and whether it holds its shape after washing. Cut off-grain and you end up with a stiff, twisted garment that pulls sideways, doesn't stretch where it needs to, and loses its shape quickly. This guide covers how to find the grainline, how to cut different knit fabrics correctly, and how to avoid costly cutting errors in production.
What Is the Grainline?
The grainline is the direction of the yarn running along the length of the fabric roll. In woven fabrics, the grainline follows the warp threads. In knit fabrics, the grainline runs along the wale columns — the vertical loops that run lengthwise down the roll.
Perpendicular to the grainline is the cross-grain (the width of the fabric). In knits, this is the direction of maximum stretch — the most elastic direction in the fabric.
In woven fabrics, stretch along the grainline is minimal (1–3%), with slightly more across the grain (3–5%). In knits the difference is far more pronounced: on-grain stretch is typically 5–10%, while cross-grain stretch ranges from 30–80% depending on the fabric type.
The basic cutting rule: the grainline marked on a pattern piece should align with the grainline of the fabric. Pattern pieces are laid lengthwise along the roll. This keeps the garment dimensionally stable in length and allows maximum stretch across the width.
Why Grain Direction Matters
Several reasons why cutting direction is critical.
Dimensional stability. Pre-shrunk fabric is stable along the grain but retains its stretch potential across the grain. Cut off-grain and the garment will shrink unevenly after washing.
Proper fit. A garment cut on-grain sits on the body as intended. Off-grain cutting causes rippling along the side seams and a twisted silhouette.
Stretch where you need it. The cuffs on a hoodie need to stretch around the wrist; the body needs to stretch across the chest and sides. Cut the wrong way and the cuffs won't go over the hand, while the body stretches across the shoulders instead.
Appearance after washing. Knit fabric cut off-grain will twist and lose its shape after the first wash. Different sections of the garment shrink at different rates, causing seams to pull and skew.
Matching panels. If the main body is cut on-grain but a pocket is cut cross-grain, the two pieces will shrink differently after washing and the pocket will pucker at the join.
How to Find the Grainline
Several methods for identifying grain direction in a piece of knit fabric.
From the roll. The simplest method. The grainline always runs along the length of the roll, perpendicular to the width. If a roll is 180 cm (71 in) wide and 50 m long, the grain runs lengthwise.
From the selvage. Most woven and knit fabrics have a selvage — the finished edge running along the length of the roll. The grainline runs parallel to the selvage. On some fabrics the selvage is marked with a coloured thread or the manufacturer's logo.
From the wale columns. On knit fabric you can see the wale columns — vertical rows of loops running down the length of the fabric (when the fabric is laid face-up). These columns are the grainline. The horizontal course rows are the cross-grain.
By stretch. Stretch the fabric in one direction, then in the perpendicular direction. The direction with less stretch is the grainline. The direction with more stretch is the cross-grain.
By shrinkage after pre-washing. After pre-washing (pre-shrinking), fabric shrinks more across the grain (4–5%) than along it (1–2%). Comparing measurements before and after will confirm grain direction.
From the label. Rolls supplied with packaging often include a grainline arrow or directional note from the manufacturer.
Stretch Comparison by Fabric Type
Stretch in different directions across common knit fabrics.
Fabric
Along grain
Cross-grain (width)
Diagonal (bias)
Single jersey 100% cotton
3–5%
30–40%
10–15%
Single jersey with spandex (elastane)
5–8%
40–50%
15–20%
Jersey 95/5 cotton-spandex
5–10%
40–60%
15–25%
Sport jersey
5–10%
40–50%
15–25%
Interlock knit
3–5%
30–40%
10–15%
2×2 rib knit
5–8%
60–80% (high-stretch rib!)
20–30%
1×1 rib knit
5–8%
50–70%
20–30%
French terry (loop-back)
3–5%
25–30%
10–15%
Brushed fleece (heavyweight)
3–5%
20–25%
8–12%
Nylon spandex (4-way stretch)
50–60%
60–80%
50–60%
Power mesh
30–40%
70–80%
40–50%
Lycra jersey
10–20%
40–50%
25–35%
Key takeaways from the table:
How to Cut Different Knit Fabrics
Cutting technique by fabric type.
Single jersey and jersey (130–220 GSM). Lay the grainline along the roll. Position pattern pieces with the long axis (garment length) parallel to the grainline. This puts the stretch across the width of the garment — exactly what a T-shirt or long-sleeve top needs.
Interlock knit and heavier jersey (200–240 GSM). Same as single jersey. Grainline runs along the roll.
2×2 rib knit for hoodie cuffs. Cuffs are cut cross-grain (across the width of the roll) because the stretch needs to work around the circumference of the wrist. This is critical to the function of the cuff. Cut on-grain and the cuff won't go over the hand.
1×1 rib knit for long-sleeve and childrenswear cuffs. Same as above — cut cross-grain.
Standalone garments in 2×2 rib (ribbed turtlenecks, warm leggings). Grainline runs along the roll. Stretch works around the body circumference.
French terry (loop-back) and brushed fleece. Grainline along the roll. Position the hoodie or sweatsuit pattern piece with the garment length running on-grain.
Nylon spandex (4-way stretch). Grainline along the roll. Nylon spandex is bi-directional but stretches slightly more cross-grain (60–80%) than on-grain (50–60%). For leggings, the primary stretch needs to work around the leg circumference, so the grainline runs along the leg length.
Power mesh. Follow the stretch. Power mesh has one primary stretch direction (cross-grain), and that stretch should be used for the compression zones. On a corset, the grainline runs vertically and the cross-grain stretch works around the body for shaping.
For a full overview of knit fabric types, see our guide "How to Choose Knit Fabric" and for activewear fabrics see "Nylon Spandex for Swimwear and Activewear".
Common Cutting Mistakes
The most frequent errors in knit fabric cutting.
Cutting 2×2 rib cuffs on-grain. The most common mistake. Rib cut along the roll won't stretch enough to go over the hand. Rib knit for cuffs must always be cut cross-grain.
Cutting nylon spandex leggings on-grain only. Leggings won't stretch across the hip, will sag, and will be uncomfortable during deep squats. Cut nylon spandex so the stretch runs along the length of the garment.
Cutting a T-shirt cross-grain. The garment length becomes shorter than drafted, the fit is compromised, and the fabric twists after the first wash. Single jersey and jersey must be cut with garment length on-grain.
Cutting panels of the same garment in different grain directions. If the body is cut on-grain and a pocket or panel is cut cross-grain, they will shrink differently after washing and the join will be visible. All panels of a single garment must be cut in the same grain direction.
Ignoring the selvage. The selvage is denser than the main fabric and should not be included in the seam allowance. Allow 1–2 cm (roughly ½ in) clearance from the selvage.
Cutting from an off-roll piece without checking grain direction first. If fabric arrives without a roll or selvage (off-cuts from other production runs), always identify the grainline first — by stretch or wale columns — before cutting.
Cutting on the bias. Bias-cut knit garments spiral and twist after the first wash. Bias cutting is not used in mainstream knit garment production.
Cutting without smoothing the fabric first. If the roll has been unevenly unwound, laying a pattern on top of distorted fabric will produce off-grain pieces. Always smooth the fabric flat on a level table before cutting.
Production Yield and Defect Rates
Correct on-grain cutting is directly linked to batch consistency and return rates.
Without consistent grain direction: in a production run of 100 hoodies with inconsistent cutting, expect 10–15% returns citing "garment twisted after washing," "one sleeve longer than the other," or "doesn't fit like the photo."
With correct grain direction: the same production run typically sees 1–3% returns for unrelated reasons.
For detailed fabric consumption and yardage estimates by garment type, see our guides "French Terry GSM Guide" and "Jersey GSM Guide." Industrial marker-making across multiple sizes in a single layout typically reduces fabric consumption by 5–10% through optimised nesting.
Defects caused by incorrect grain direction are not recoverable. The cut pieces cannot be used for the intended garment and the fabric is written off. COGS is lost entirely.
Worst-case scenario: a production batch of 100 hoodies is pre-washed correctly but cut off-grain. After the customer's first wash, 30–50% of the batch is returned as defective. This kind of error can represent a significant loss — both in fabric cost and the labour already invested in sewing the batch.
Recommended Fabrics for Production
Basic single jersey for summer T-shirts — pre-wash before cutting: single jersey 140 GSM 100% cotton, open-end (rotor-spun), black.
Premium French terry for hoodies — pre-washing required: heavyweight loop-back French terry 310 GSM 100% cotton, carded, denim.
Sport jersey with spandex (elastane) for fitted styles: sport jersey 230 GSM 94/6 polyester-spandex, white.
2×2 rib knit for hoodie cuffs — cut cross-grain: 2×2 rib knit 320 GSM 95/5 cotton-spandex (elastane), compact combed cotton, black.
Nylon spandex (4-way stretch) for leggings and swimwear: matte nylon spandex 260 GSM 88/12 polyester-spandex, white.
Full range available in the Knit Fabrics category, French Terry & Fleece, and Swimwear Fabrics. Related guides: "Pre-Washing Fabric Before Cutting," "How to Choose Knit Fabric," and "2×2 Rib vs 1×1 Rib: Which to Use."
Frequently Asked Questions
What is the grainline in knit fabric? The direction of the yarn running along the length of the fabric roll. In knit fabrics this corresponds to the wale columns — the vertical rows of loops. Perpendicular to the grainline is the cross-grain, where stretch is at its maximum.
How do I find the grainline on knit fabric? By the wale columns (vertical rows of loops on the face of the fabric), or by stretch testing — the direction with less stretch is the grainline.
Can I cut knit fabric on the bias? Not recommended. Bias-cut knit garments twist and spiral after washing. Bias cutting is not used in mainstream knit production.
Which direction should I cut rib knit cuffs? Cross-grain only (across the width of the roll). The stretch must work around the circumference of the wrist. Cut on-grain and the cuff won't stretch over the hand.
What happens if I cut a knit garment off-grain? The garment will twist and distort after the first wash. Finished dimensions will not match the pattern. The defect is not recoverable.
How do I cut nylon spandex for leggings? Nylon spandex is bi-directional but stretches slightly more cross-grain (60–80%) than on-grain (50–60%). For leggings, the primary stretch should run along the garment length (along the leg). Cut along the roll.
What is the selvage and why does it matter? The selvage is the finished edge running along the length of the roll. It is denser than the main fabric and must not be included in the seam allowance. The grainline runs parallel to the selvage, so the selvage is a reliable reference for orienting pattern pieces.
How much clearance should I leave from the selvage? Allow 1–2 cm (roughly ½ in). The selvage distorts the edge of the fabric and should not be cut into usable pieces.
The selvage keeps curling back — what do I do? Smooth the fabric flat on a level surface and let it rest for 24 hours. If the selvage continues to curl badly, this indicates poor fabric quality — consider rejecting the batch.
How do I handle fabric with a printed or jacquard repeat? Cut on-grain and account for the repeat. Repeats must match at the seams. Add 10–15% to your calculated yardage to allow for pattern matching.
Is the grainline the same in woven and knit fabrics? The principle is the same: the grainline is the stable, low-stretch direction. In wovens it follows the warp threads (lengthwise yarns). In knits it follows the wale columns (vertical rows of loops). Same concept, different fabric structure.