Why Do T-Shirts Twist After Washing?

01   Washing gives the fabric a chance to readjust

Cotton yarn is made by twisting fibres together. Some yarns retain a tendency to turn back on themselves, known as residual torque. Once the yarn is knitted into loops, that force can affect how the loops align.

Single jersey, a common T-shirt fabric, has a different structure on its face and reverse, making it more susceptible to this kind of imbalance.

When the fabric gets wet and is agitated during washing, stresses left from spinning, knitting or finishing can be released. The loops rearrange, and the twisting becomes more visible.

So a problem that appears after washing may have started well before the laundry. Twisting can occur even without tumble drying.^{1, 2, 3, 4}

02   Stability begins before cutting

Yarn twist and its tendency to untwist, the knitted structure, and the tension and relaxation used during dyeing and finishing can all influence how a fabric behaves after washing.

Appropriate finishing can reduce change, but “pre-shrunk” is not a complete guarantee against twisting.

If fabric is pulled flat and cut before it has fully stabilised, it can become a garment that looks straight at first but changes direction after its first wash.

Whether the pieces follow the fabric grain, and whether they are stretched too much during sewing, also affect the finished appearance.

Careful cutting and sewing matter, but seams alone cannot remove a fabric’s underlying tendency to twist.

Interlock, a more balanced double-knit structure, generally offers better structural stability. The actual result still depends on the yarn, knitting and finishing conditions together.^{2, 3, 5, 6}

03   Does thicker fabric or better cotton mean less twisting?

When choosing a T-shirt, it is easy to focus on its thickness or the name of the cotton. Each tells us only part of the story.

GSM means grams per square metre of fabric. It measures fabric weight, not stitch density. A heavier fabric may feel more substantial, but weight alone cannot tell you whether it will twist after washing.

Long-staple cotton can provide the basis for fine, smooth yarns. How well a garment wears also depends on the yarn, knitted structure, finishing and the way it is used.

A silky hand or an appealing cotton name cannot replace observing the garment after washing.⁷

04   When shopping, ask one more question: “What happens after washing?”

Let a new T-shirt lie naturally flat and look for any obvious skew in the side seams, hem or fabric grain. Avoid pulling the fabric into position just to line up the seams. This can reveal its current condition, though it cannot predict every change after washing.

Beyond asking how thick the fabric is, find out whether the brand has checked the finished garment’s dimensions, appearance and twisting after washing.

If there are test results, consider the wash conditions and the number of cycles too, so you know what those results mean. The feel of new fabric and photographs of an unworn garment reveal only so much about how it will perform over time.

05   Care for the garment, and understand the limits of care

Check the care label before washing. Choose the water temperature, wash cycle and drying method it specifies for the garment.

Where the label allows, use a gentler cycle, avoid unnecessary heat and forceful wringing, then gently reshape the garment before drying it as directed.

These steps can reduce additional strain, but they cannot be relied on to correct an inherently unstable fabric.

If the side seam has already moved noticeably towards the front or back, repeated pulling or high-temperature pressing may not straighten it permanently.

Photograph the garment lying naturally flat and contact the original retailer, explaining how it was washed.⁸