What Causes Fabric Spirality and Twisted Seams in Knitwear?

Introduction

A knitted garment may look correct immediately after sewing but develop twisted side seams after washing.

The side seam may rotate toward the front or back of the body, while hems, panels and printed designs may also appear uneven.

This problem is commonly associated with fabric spirality or garment twisting.

Spirality can affect T-shirts, sports tops, leggings, dresses and other knitted garments. For apparel brands, identifying the risk before bulk cutting can help reduce rejected production, customer complaints and inconsistent sizing.

What Is Fabric Spirality?

Fabric spirality is a form of dimensional distortion in which knitted loops or fabric courses do not remain correctly aligned.

After relaxation or washing, the fabric may rotate instead of maintaining a straight vertical direction.

In a finished garment, this can cause:

• Twisted side seams

• Rotated panels

• Uneven hems

• Distorted prints

• Poor garment balance

• Uncomfortable fit

• Differences between the left and right sides

Spirality is particularly associated with some knitted constructions because their loops can react to yarn torque and production tension.

Spirality vs Shrinkage

Shrinkage is a reduction in fabric length or width.

Spirality is a rotational distortion.

A fabric can have acceptable lengthwise and widthwise shrinkage while still developing twisted seams.

A complete dimensional-stability evaluation should therefore examine:

• Lengthwise shrinkage

• Widthwise shrinkage

• Growth

• Spirality

• Skew

• Bow

• Surface distortion

Checking only garment measurements may fail to identify visible twisting.

Spirality vs Skew and Bow

These terms describe different forms of distortion.

Spirality

Spirality generally creates a rotational effect in the fabric or garment.

Skew

Skew occurs when courses, patterns or horizontal reference lines move diagonally instead of remaining perpendicular to the fabric edges.

Bow

Bow occurs when a horizontal line curves across the width of the fabric.

All three can affect cutting, sewing and garment appearance, but their causes and evaluation methods may differ.

Why Does Spirality Matter?

Garment Appearance

A rotating side seam makes a garment look poorly constructed even when its measurements remain within tolerance.

Fit and Comfort

Twisted panels can pull the garment unevenly around the body.

This may be especially noticeable in fitted sportswear and leggings.

Printed and Patterned Garments

Stripes, jacquard designs and printed graphics make distortion more visible.

A small amount of rotation may become obvious when a design is expected to remain straight.

Production Efficiency

If spirality is discovered after bulk washing, garments may require rework or be rejected.

The problem is easier to manage before fabric cutting.

Customer Satisfaction

Consumers may view twisted seams as evidence of poor-quality fabric or sewing.

Severe distortion can lead to returns and negative reviews.

What Causes Fabric Spirality?

Yarn Torque

Yarn can contain stored rotational energy created during spinning or twisting.

When the fabric is relaxed or washed, this energy may cause the knitted loops to rotate.

The type of yarn, twist direction and twist level can all influence the result.

Knitting Construction

Some knitted structures are naturally more sensitive to spirality than others.

Single-knit constructions may show greater rotational tendency because their loops are not balanced in the same way as more stable double-knit structures.

However, actual performance depends on yarn, machine settings and finishing.

Knitting Tension

Uneven or excessive knitting tension can introduce internal stress.

The fabric may appear stable while held under production tension but distort after relaxation.

Machine Settings

Needle condition, feed settings, take-down tension and machine adjustment can influence loop formation and fabric balance.

Inconsistent settings may create differences across production lots.

Dyeing and Finishing Tension

Fabric is exposed to tension during dyeing, washing, drying, heat setting, compacting and rolling.

If the material is stretched or distorted during these processes, it may attempt to return to a more relaxed condition later.

Inadequate Relaxation

Freshly finished fabric can contain stored tension.

If it is cut immediately after unrolling, its dimensions and alignment may change after the garment is sewn.

Washing and Drying

Moisture, heat and mechanical action release tension within the fabric.

A garment that looks correct before washing may show spirality after its first care cycle.

Cutting Direction

Pattern pieces that are not correctly aligned with the fabric direction can produce twisted garments.

Even stable fabric may create problems if the cutting grain is inaccurate.

Sewing Tension

Uneven feeding, excessive thread tension or unsuitable machinery can pull one layer more than another.

This type of sewing distortion can resemble fabric spirality.

Mixed Materials

The main fabric, rib, lining or trim may shrink and relax differently.

Incompatible materials can pull the garment out of balance after washing.

Which Garments Are Most Affected?

Fitted and patterned garments often make the problem more visible.

How to Evaluate Fabric Spirality

Step 1: Use Representative Finished Fabric

Test fabric with the intended:

• Fiber composition

• Yarn

• Knitting construction

• GSM

• Width

• Color

• Dyeing process

• Finish

Greige or unfinished fabric may not represent the final result.

Step 2: Relax the Sample

Allow the material to rest without tension.

Stretch fabric and tightly rolled fabric may change width and alignment after being opened.

Step 3: Mark Reference Lines

Mark clear vertical and horizontal reference lines on the sample.

The lines should be aligned with the intended fabric direction before washing.

Step 4: Wash and Dry the Sample

Use the care method planned for the finished garment.

Record:

• Washing program

• Water temperature

• Detergent

• Drying method

• Number of cycles

Different methods can produce different results.

Step 5: Allow the Sample to Rest

After drying, place the fabric flat without pulling it and allow it to stabilize.

Step 6: Examine Rotation and Distortion

Check whether the original vertical and horizontal lines remain correctly aligned.

Look for:

• Diagonal movement

• Curved lines

• Rotational distortion

• Uneven edges

• Changes in width or length

Step 7: Produce a Garment Sample

Fabric-level testing should be followed by a complete garment wash test.

The sample should use the planned pattern, cutting direction, seams and trims.

After washing, check whether:

• Side seams remain vertical

• Hems remain level

• Panels stay aligned

• Prints remain centered

• The garment hangs evenly

• Left and right sides remain balanced

Why Garment Testing Is Essential

Fabric spirality and garment twisting are not always caused by the same factor.

The final result can be influenced by:

• Fabric distortion

• Pattern alignment

• Cutting

• Sewing tension

• Seam construction

• Trims

• Washing

• Pressing

If a fabric sample remains stable but the garment twists, the cutting or sewing process should also be investigated.

How Can Spirality Be Reduced?

Use Suitable Yarn

Yarn selection and twist balance can help reduce stored rotational energy.

The correct solution depends on the fiber and knitting structure.

Control Knitting Conditions

Consistent machine settings, loop formation and tension improve fabric balance.

Optimize Finishing

Appropriate relaxation, heat setting or compacting may improve dimensional stability when suitable for the fiber and fabric construction.

Relax Fabric Before Cutting

Allowing the fabric to rest helps release part of the stored production tension.

The required relaxation time should be determined according to the material and factory process.

Align Pattern Pieces Correctly

Patterns should follow the approved fabric direction.

Operators should not straighten distorted fabric by force before cutting.

Control Spreading

Fabric should be spread without excessive lengthwise tension.

Stretching the material during spreading may create additional distortion after cutting.

Review Sewing Settings

Adjust thread tension, differential feeding and seam construction when sewing contributes to twisting.

Match Trims and Panels

Ribs, linings and secondary fabrics should have compatible shrinkage and relaxation behavior.

Conduct Preproduction Wash Tests

A washed garment sample can reveal twisting before bulk cutting begins.

Common Evaluation Mistakes

Checking Only Length and Width Shrinkage

A fabric can pass shrinkage requirements but still rotate.

Inspecting Only Unwashed Garments

Spirality may become visible only after moisture and mechanical action release the stored tension.

Forcing the Fabric Straight Before Measuring

Pulling or stretching the sample can hide its natural distortion.

Blaming the Fabric Without Checking Sewing

Uneven feeding and thread tension can also cause twisted seams.

Testing Only a Small Swatch

A small sample may not reveal the same distortion seen across a complete garment panel.

Ignoring Stripes and Printed Designs

Patterned fabrics make small distortions more noticeable and may require stricter control.

Approving One Roll Only

Different production lots or rolls may not have identical tension and alignment.

Questions to Ask Your Fabric Supplier

Before confirming knitted fabric, ask:

1. Has the finished fabric been tested for spirality?

2. What washing and drying conditions were used?

3. Was the fabric relaxed before testing?

4. What knitting construction is used?

5. Does the material require relaxation before cutting?

6. Has skew and bow also been evaluated?

7. Is the result consistent between colors and lots?

8. What finishing process is used to improve stability?

9. Can full-width sample yardage be supplied?

10. Is a garment wash test recommended before bulk production?

Preproduction Quality Checklist

Before cutting bulk fabric, confirm:

• Composition

• GSM

• Usable width

• Fabric direction

• Lengthwise and widthwise shrinkage

• Spirality

• Skew and bow

• Edge condition

• Roll-to-roll consistency

• Garment wash-test result

Keep an approved fabric sample and washed garment as production references.

Work With an Experienced Knitted Fabric Supplier

Hongjun Fabric supplies nylon spandex, polyester spandex and other knitted materials for activewear, yoga wear, sportswear and swimwear.

Fabric composition, construction, weight, stretch, finishing and dimensional-stability requirements can be discussed according to different garment applications.

Buyers should request representative samples and complete garment wash testing before confirming bulk production.

Conclusion

Fabric spirality can cause twisted seams, uneven hems and distorted garment panels.

It may be influenced by yarn torque, knitting construction, production tension, finishing, relaxation, cutting and sewing.

Checking only lengthwise and widthwise shrinkage is not enough. Buyers should evaluate fabric alignment after washing and produce a complete preproduction garment.

Contact Hongjun Fabric to request knitted fabric samples and discuss dimensional-stability requirements for your next apparel project.