Why Clothes Pill—and What You Can Actually Do About It

Estimated reading time: 5 minutes.

You pull on a favourite sweater and notice a few small, fuzzy balls near the sleeves.

Maybe they appeared under the arms. Maybe they showed up where a bag rests against your side. Either way, the garment suddenly looks more worn than it did the last time you reached for it.

That surface change is called pilling. It can be disappointing, but it isn't always a simple sign that a fabric is poor quality. Pilling is shaped by the fibres, yarn, fabric construction, finishing, care, and the rubbing a garment experiences in real life.

Understanding that mix makes it easier to care for what you own—and to ask better questions about what you buy next.

1. Start with what a pill actually is

A pill forms when loose fibre ends work their way to a fabric's surface, become fuzzy, and tangle together through friction. Some of those tangled fibres remain anchored in the material, leaving the familiar little ball behind.

That's why pilling often appears in high-contact areas. On knitwear, those can include elbows, underarms, sleeves, and the sides of the body. Woolmark's guidance points to rubbing during wear as a key cause, including repeated contact with a desk, chair, bag, or the garment itself.

The same basic idea applies beyond wool: friction starts the process, but the fabric determines how easily fibres emerge, how readily they tangle, and how long the pills remain attached.

2. Don't judge pilling by fibre content alone

It's tempting to look at a fibre label and predict exactly how a garment will age. The label matters, but it doesn't tell the whole story.

A peer-reviewed study of weft-knitted fabrics found that pilling can be influenced by fibre type and length, yarn twist and hairiness, spinning method, fabric construction, and finishing. In other words, two garments with the same fibre percentages can perform differently because the fibres were turned into yarn and fabric in different ways.

The wider industry sees the same complexity. A Defra-funded clothing-longevity report concluded that yarn length, twist, lubrication, finish, fabric weight, and density can all affect pilling. Its cashmere pilot also found that fibre damage introduced during processing increased the proportion of short fibres and made the finished garment more likely to pill or shed.

So, is pilling a quality issue?

Sometimes. Design choices, material specifications, and process control matter. But the presence of a few pills doesn't reveal the cause by itself, and it doesn't automatically tell you how strong, comfortable, or durable the rest of the garment is.

3. Reduce unnecessary friction during wear and care

You can't remove every source of rubbing from everyday life. Clothing is meant to move. You can, however, notice where repeated contact is happening.

If one side of a sweater pills more quickly, consider what touches that area: a cross-body strap, a rough jacket lining, a seat belt, or the edge of a desk. The goal isn't to stop wearing the piece. It's to understand why one area may be changing faster than another.

During washing, begin with the garment's care label. For wool specifically, Woolmark recommends turning garments inside out, avoiding fabric softener, and minimizing abrasion. Those directions shouldn't be applied blindly to every textile, but the general principle is useful: choose the gentlest process permitted by the label and avoid adding friction that the garment doesn't need.

A practical routine:

  • Close zippers and hooks that could catch softer surfaces.
  • Keep delicate knits away from rough or heavy items when their care requirements differ.
  • Use the cycle, water temperature, detergent, and drying method specified for the garment.
  • Turn an item inside out when its instructions or fibre-specific guidance recommend it.

These steps can reduce avoidable surface wear, but they can't guarantee that pilling will never occur.

4. Remove pills carefully, not aggressively

A small amount of pilling can often be managed.

Woolmark recommends three approaches for wool garments: removing a few pills by hand, using a comb gently, or using a fabric shaver. Whichever method you choose, work slowly on a clean, dry garment laid on a stable surface.

Test any tool in an inconspicuous spot first. Don't press a shaver deeply into the fabric or repeatedly scrape the same area. The aim is to lift the pills from the surface without thinning, snagging, or cutting the material underneath.

Delicate, open, embellished, or highly textured fabrics may need specialist care. If the label, garment maker, or tool instructions warn against a method, follow that guidance rather than improvising.

5. Treat laboratory ratings as useful—but not absolute

Brands and textile laboratories can test a fabric's tendency to pill before it becomes a garment. That matters, but test results still need context.

For example, ASTM D3512/D3512M-22 uses a random-tumble tester and grades the resulting surface change on a visual scale from 5, meaning no pilling, to 1, meaning very severe pilling. ASTM also identifies other methods, including brush and Martindale tests.

Different methods create different kinds of abrasion, and a short laboratory test can't reproduce every body, bag, chair, wash routine, or month of wear. The ASTM page itself cautions that its random-tumble method isn't recommended for acceptance testing and describes the rating scale as arbitrary.

That doesn't make testing pointless. It means a score is most useful when you also know the method, test conditions, and performance standard the supplier or brand used. A bare claim such as “anti-pilling” tells you much less.

Make surface care part of the long view

Pilling sits at the meeting point between design and daily life. Fibre selection, yarn engineering, fabric structure, manufacturing, movement, and care can all leave their mark.

For the wearer, the most useful response is simple: follow the label, reduce needless friction, remove pills gently, and pay attention to patterns. For the industry, the responsibility reaches further—to choose materials thoughtfully, test them appropriately, and explain performance without pretending that one number can predict every outcome.

At Arcadia, we believe clothing information should help you understand what you're wearing, not just tell you what to buy. Pilling can't always be prevented, and general advice can't replace the instructions for a specific garment. But a little knowledge—and a little careful maintenance—can help a well-worn piece keep its place in your rotation.

Move forward.

Sources & further reading

Sources reviewed October 7, 2026. The research and guidance above concern textiles generally and do not constitute independent testing of Arcadia products.

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